6775431491664 has 180 divisors, whose sum is σ = 21939271317600. Its totient is φ = 1945099854720.

The previous prime is 6775431491657. The next prime is 6775431491669. The reversal of 6775431491664 is 4661941345776.

6775431491664 is a `hidden beast` number, since 6 + 7 + 7 + 54 + 31 + 491 + 6 + 64 = 666.

It is a super-2 number, since 2×6775431491664² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6775431491669) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9902004 + ... + 10564115.

Almost surely, 2^{6775431491664} is an apocalyptic number.

It is an amenable number.

6775431491664 is an abundant number, since it is smaller than the sum of its proper divisors (15163839825936).

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

6775431491664 is a wasteful number, since it uses less digits than its factorization.

6775431491664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20466174 (or 20466154 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 63.

The spelling of 6775431491664 in words is "six trillion, seven hundred seventy-five billion, four hundred thirty-one million, four hundred ninety-one thousand, six hundred sixty-four".