15556505655 has 32 divisors (see below), whose sum is σ = 25088788224. Its totient is φ = 8230864896.

The previous prime is 15556505651. The next prime is 15556505689. The reversal of 15556505655 is 55650565551.

It is not a de Polignac number, because 15556505655 - 2² = 15556505651 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15556505651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1405252 + ... + 1416278.

It is an arithmetic number, because the mean of its divisors is an integer number (784024632).

Almost surely, 2^15556505655 is an apocalyptic number.

15556505655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15556505655 is a deficient number, since it is larger than the sum of its proper divisors (9532282569).

15556505655 is a wasteful number, since it uses less digits than its factorization.

15556505655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11775.

The product of its (nonzero) digits is 2812500, while the sum is 48.

The spelling of 15556505655 in words is "fifteen billion, five hundred fifty-six million, five hundred five thousand, six hundred fifty-five".