6556005666531 has 6 divisors (see below), whose sum is σ = 9469785962780. Its totient is φ = 4370670444348.

The previous prime is 6556005666521. The next prime is 6556005666547. The reversal of 6556005666531 is 1356665006556.

It is not a de Polignac number, because 6556005666531 - 2⁹ = 6556005666019 is a prime.

It is a super-2 number, since 2×6556005666531² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6556005666521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 364222537021 + ... + 364222537038.

Almost surely, 2^{6556005666531} is an apocalyptic number.

6556005666531 is a deficient number, since it is larger than the sum of its proper divisors (2913780296249).

6556005666531 is a wasteful number, since it uses less digits than its factorization.

6556005666531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728445074065 (or 728445074062 counting only the distinct ones).

The product of its (nonzero) digits is 14580000, while the sum is 54.

The spelling of 6556005666531 in words is "six trillion, five hundred fifty-six billion, five million, six hundred sixty-six thousand, five hundred thirty-one".