15555788656 has 10 divisors (see below), whose sum is σ = 30139340552. Its totient is φ = 7777894320.

The previous prime is 15555788653. The next prime is 15555788657. The reversal of 15555788656 is 65688755551.

It is a junction number, because it is equal to n+sod(n) for n = 15555788594 and 15555788603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15555788653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486118380 + ... + 486118411.

Almost surely, 2^15555788656 is an apocalyptic number.

15555788656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15555788656 is a deficient number, since it is larger than the sum of its proper divisors (14583551896).

15555788656 is an equidigital number, since it uses as much as digits as its factorization.

15555788656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972236799 (or 972236793 counting only the distinct ones).

The product of its digits is 50400000, while the sum is 61.

The spelling of 15555788656 in words is "fifteen billion, five hundred fifty-five million, seven hundred eighty-eight thousand, six hundred fifty-six".