15556665552 has 40 divisors (see below), whose sum is σ = 40194689280. Its totient is φ = 5184698880.

The previous prime is 15556665533. The next prime is 15556665571. The reversal of 15556665552 is 25556665551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (15556665533) and next prime (15556665571).

It is a junction number, because it is equal to n+sod(n) for n = 15556665495 and 15556665504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310849 + ... + 357407.

It is an arithmetic number, because the mean of its divisors is an integer number (1004867232).

Almost surely, 2^15556665552 is an apocalyptic number.

15556665552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15556665552 is an abundant number, since it is smaller than the sum of its proper divisors (24638023728).

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

15556665552 is a wasteful number, since it uses less digits than its factorization.

15556665552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53531 (or 53525 counting only the distinct ones).

The product of its digits is 6750000, while the sum is 51.

Subtracting 15556665552 from its reverse (25556665551), we obtain a palindrome (9999999999).

The spelling of 15556665552 in words is "fifteen billion, five hundred fifty-six million, six hundred sixty-five thousand, five hundred fifty-two".