6567997656 has 32 divisors (see below), whose sum is σ = 17912721600. Its totient is φ = 1990302240.

The previous prime is 6567997637. The next prime is 6567997663.

6567997656 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12439126 + ... + 12439653.

It is an arithmetic number, because the mean of its divisors is an integer number (559772550).

Almost surely, 2^6567997656 is an apocalyptic number.

6567997656 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6567997656 is an abundant number, since it is smaller than the sum of its proper divisors (11344723944).

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

6567997656 is a wasteful number, since it uses less digits than its factorization.

6567997656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24878799 (or 24878795 counting only the distinct ones).

The product of its digits is 128595600, while the sum is 66.

The square root of 6567997656 is about 81043.1838959946. The cubic root of 6567997656 is about 1872.7407603304.

The spelling of 6567997656 in words is "six billion, five hundred sixty-seven million, nine hundred ninety-seven thousand, six hundred fifty-six".