55561511660 has 12 divisors (see below), whose sum is σ = 116679174528. Its totient is φ = 22224604656.

The previous prime is 55561511657. The next prime is 55561511693. The reversal of 55561511660 is 6611516555.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1389037772 + ... + 1389037811.

It is an arithmetic number, because the mean of its divisors is an integer number (9723264544).

Almost surely, 2^55561511660 is an apocalyptic number.

It is an amenable number.

55561511660 is an abundant number, since it is smaller than the sum of its proper divisors (61117662868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55561511660 is a wasteful number, since it uses less digits than its factorization.

55561511660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778075592 (or 2778075590 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 55561511660 in words is "fifty-five billion, five hundred sixty-one million, five hundred eleven thousand, six hundred sixty".