55603475661 has 32 divisors (see below), whose sum is σ = 79183872000. Its totient is φ = 34606958400.

The previous prime is 55603475659. The next prime is 55603475731. The reversal of 55603475661 is 16657430655.

It is not a de Polignac number, because 55603475661 - 2¹ = 55603475659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55603475661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55603475621) 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, 1052836 + ... + 1104386.

It is an arithmetic number, because the mean of its divisors is an integer number (2474496000).

Almost surely, 2^55603475661 is an apocalyptic number.

It is an amenable number.

55603475661 is a deficient number, since it is larger than the sum of its proper divisors (23580396339).

55603475661 is a wasteful number, since it uses less digits than its factorization.

55603475661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51849.

The product of its (nonzero) digits is 2268000, while the sum is 48.

The spelling of 55603475661 in words is "fifty-five billion, six hundred three million, four hundred seventy-five thousand, six hundred sixty-one".