15561060555 has 16 divisors (see below), whose sum is σ = 25756238880. Its totient is φ = 8013051648.

The previous prime is 15561060509. The next prime is 15561060569. The reversal of 15561060555 is 55506016551.

It is not a de Polignac number, because 15561060555 - 2⁶ = 15561060491 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17885842 + ... + 17886711.

It is an arithmetic number, because the mean of its divisors is an integer number (1609764930).

Almost surely, 2^15561060555 is an apocalyptic number.

15561060555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15561060555 is a deficient number, since it is larger than the sum of its proper divisors (10195178325).

15561060555 is a wasteful number, since it uses less digits than its factorization.

15561060555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35772590.

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 15561060555 in words is "fifteen billion, five hundred sixty-one million, sixty thousand, five hundred fifty-five".