15552311440 has 80 divisors (see below), whose sum is σ = 36913280256. Its totient is φ = 6092352000.

The previous prime is 15552311431. The next prime is 15552311443. The reversal of 15552311440 is 4411325551.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×15552311440² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15552311443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 848614 + ... + 866746.

Almost surely, 2^15552311440 is an apocalyptic number.

15552311440 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 15552311440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18456640128).

15552311440 is an abundant number, since it is smaller than the sum of its proper divisors (21360968816).

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

15552311440 is a wasteful number, since it uses less digits than its factorization.

15552311440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18368 (or 18362 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 15552311440 its reverse (4411325551), we get a palindrome (19963636991).

The spelling of 15552311440 in words is "fifteen billion, five hundred fifty-two million, three hundred eleven thousand, four hundred forty".