15225421640 has 128 divisors (see below), whose sum is σ = 40340160000. Its totient is φ = 5098705920.

The previous prime is 15225421609. The next prime is 15225421643. The reversal of 15225421640 is 4612452251.

15225421640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 15225421597 and 15225421606.

It is not an unprimeable number, because it can be changed into a prime (15225421643) 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 31 ways as a sum of consecutive naturals, for example, 2645486 + ... + 2651234.

It is an arithmetic number, because the mean of its divisors is an integer number (315157500).

Almost surely, 2^15225421640 is an apocalyptic number.

15225421640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15225421640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20170080000).

15225421640 is an abundant number, since it is smaller than the sum of its proper divisors (25114738360).

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

15225421640 is a wasteful number, since it uses less digits than its factorization.

15225421640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6247 (or 6243 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 15225421640 its reverse (4612452251), we get a palindrome (19837873891).

The spelling of 15225421640 in words is "fifteen billion, two hundred twenty-five million, four hundred twenty-one thousand, six hundred forty".