15556989952 has 176 divisors, whose sum is σ = 38520282240. Its totient is φ = 6127091712.

The previous prime is 15556989947. The next prime is 15556989961. The reversal of 15556989952 is 25998965551.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5238324 + ... + 5241292.

It is an arithmetic number, because the mean of its divisors is an integer number (218865240).

Almost surely, 2^15556989952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15556989952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19260141120).

15556989952 is an abundant number, since it is smaller than the sum of its proper divisors (22963292288).

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

15556989952 is a wasteful number, since it uses less digits than its factorization.

15556989952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3056 (or 3038 counting only the distinct ones).

The product of its digits is 43740000, while the sum is 64.

The spelling of 15556989952 in words is "fifteen billion, five hundred fifty-six million, nine hundred eighty-nine thousand, nine hundred fifty-two".