55566611555 has 32 divisors (see below), whose sum is σ = 82611207168. Its totient is φ = 34938864000.

The previous prime is 55566611473. The next prime is 55566611563. The reversal of 55566611555 is 55511666555.

It is a de Polignac number, because none of the positive numbers 2^k-55566611555 is a prime.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 335681 + ... + 473090.

It is an arithmetic number, because the mean of its divisors is an integer number (2581600224).

Almost surely, 2^55566611555 is an apocalyptic number.

55566611555 is a deficient number, since it is larger than the sum of its proper divisors (27044595613).

55566611555 is a wasteful number, since it uses less digits than its factorization.

55566611555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808947.

The product of its digits is 3375000, while the sum is 50.

Subtracting from 55566611555 its product of digits (3375000), we obtain a palindrome (55563236555).

The spelling of 55566611555 in words is "fifty-five billion, five hundred sixty-six million, six hundred eleven thousand, five hundred fifty-five".