15551356555 has 16 divisors (see below), whose sum is σ = 21410573760. Its totient is φ = 10622287872.

The previous prime is 15551356523. The next prime is 15551356559. The reversal of 15551356555 is 55565315551.

It is not a de Polignac number, because 15551356555 - 2⁵ = 15551356523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15551356559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 855450 + ... + 873439.

It is an arithmetic number, because the mean of its divisors is an integer number (1338160860).

Almost surely, 2^15551356555 is an apocalyptic number.

15551356555 is a deficient number, since it is larger than the sum of its proper divisors (5859217205).

15551356555 is a wasteful number, since it uses less digits than its factorization.

15551356555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729158.

The product of its digits is 1406250, while the sum is 46.

The spelling of 15551356555 in words is "fifteen billion, five hundred fifty-one million, three hundred fifty-six thousand, five hundred fifty-five".