20655660555 has 40 divisors (see below), whose sum is σ = 37153770192. Its totient is φ = 10978690752.

The previous prime is 20655660527. The next prime is 20655660583. The reversal of 20655660555 is 55506655602.

20655660555 is a `hidden beast` number, since 20 + 65 + 566 + 0 + 5 + 5 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (20655660527) and next prime (20655660583).

It is not a de Polignac number, because 20655660555 - 2⁵ = 20655660523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20655660555.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 31632 + ... + 205698.

Almost surely, 2^20655660555 is an apocalyptic number.

20655660555 is a deficient number, since it is larger than the sum of its proper divisors (16498109637).

20655660555 is a wasteful number, since it uses less digits than its factorization.

20655660555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174377 (or 174368 counting only the distinct ones).

The product of its (nonzero) digits is 1350000, while the sum is 45.

The spelling of 20655660555 in words is "twenty billion, six hundred fifty-five million, six hundred sixty thousand, five hundred fifty-five".