6464536174640 has 20 divisors (see below), whose sum is σ = 15030046606224. Its totient is φ = 2585814469824.

The previous prime is 6464536174571. The next prime is 6464536174693. The reversal of 6464536174640 is 464716354646.

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

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

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, 40403351012 + ... + 40403351171.

Almost surely, 2^{6464536174640} is an apocalyptic number.

It is an amenable number.

6464536174640 is an abundant number, since it is smaller than the sum of its proper divisors (8565510431584).

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

6464536174640 is a wasteful number, since it uses less digits than its factorization.

6464536174640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80806702196 (or 80806702190 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 56.

The spelling of 6464536174640 in words is "six trillion, four hundred sixty-four billion, five hundred thirty-six million, one hundred seventy-four thousand, six hundred forty".