6520166253564 has 48 divisors (see below), whose sum is σ = 15315726107136. Its totient is φ = 2158818984000.

The previous prime is 6520166253467. The next prime is 6520166253617. The reversal of 6520166253564 is 4653526610256.

It is a super-2 number, since 2×6520166253564² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23036634 + ... + 23317950.

It is an arithmetic number, because the mean of its divisors is an integer number (319077627232).

Almost surely, 2^{6520166253564} is an apocalyptic number.

It is an amenable number.

6520166253564 is an abundant number, since it is smaller than the sum of its proper divisors (8795559853572).

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

6520166253564 is a wasteful number, since it uses less digits than its factorization.

6520166253564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294266 (or 294264 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 51.

The spelling of 6520166253564 in words is "six trillion, five hundred twenty billion, one hundred sixty-six million, two hundred fifty-three thousand, five hundred sixty-four".