6465156560 has 20 divisors (see below), whose sum is σ = 15031489188. Its totient is φ = 2586062592.

The previous prime is 6465156541. The next prime is 6465156583. The reversal of 6465156560 is 656515646.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4564894096 + 1900262464 = 67564^2 + 43592^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×6465156560² = 83596498690622067200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40407149 + ... + 40407308.

Almost surely, 2^6465156560 is an apocalyptic number.

It is an amenable number.

6465156560 is an abundant number, since it is smaller than the sum of its proper divisors (8566332628).

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

6465156560 is a wasteful number, since it uses less digits than its factorization.

6465156560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80814470 (or 80814464 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

The square root of 6465156560 is about 80406.1972735933. The cubic root of 6465156560 is about 1862.9148961437.

The spelling of 6465156560 in words is "six billion, four hundred sixty-five million, one hundred fifty-six thousand, five hundred sixty".