15542421440 has 112 divisors (see below), whose sum is σ = 45551335872. Its totient is φ = 4918910976.

The previous prime is 15542421431. The next prime is 15542421449. The reversal of 15542421440 is 4412424551.

15542421440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (15542421431) and next prime (15542421449).

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 15542421397 and 15542421406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15542421449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237749 + ... + 295988.

It is an arithmetic number, because the mean of its divisors is an integer number (406708356).

Almost surely, 2^15542421440 is an apocalyptic number.

15542421440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15542421440 is an abundant number, since it is smaller than the sum of its proper divisors (30008914432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15542421440 is a wasteful number, since it uses less digits than its factorization.

15542421440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533774 (or 533764 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 32.

Adding to 15542421440 its reverse (4412424551), we get a palindrome (19954845991).

The spelling of 15542421440 in words is "fifteen billion, five hundred forty-two million, four hundred twenty-one thousand, four hundred forty".