6556477909231 has 4 divisors (see below), whose sum is σ = 6575933333632. Its totient is φ = 6537022484832.

The previous prime is 6556477909171. The next prime is 6556477909237. The reversal of 6556477909231 is 1329097746556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6556477909231 - 2²⁵ = 6556444354799 is a prime.

It is a super-2 number, since 2×6556477909231² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6556477909237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9727711695 + ... + 9727712368.

It is an arithmetic number, because the mean of its divisors is an integer number (1643983333408).

Almost surely, 2^{6556477909231} is an apocalyptic number.

6556477909231 is a deficient number, since it is larger than the sum of its proper divisors (19455424401).

6556477909231 is a wasteful number, since it uses less digits than its factorization.

6556477909231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19455424400.

The product of its (nonzero) digits is 85730400, while the sum is 64.

The spelling of 6556477909231 in words is "six trillion, five hundred fifty-six billion, four hundred seventy-seven million, nine hundred nine thousand, two hundred thirty-one".