6464713621 has 4 divisors (see below), whose sum is σ = 6561201952. Its totient is φ = 6368225292.

The previous prime is 6464713597. The next prime is 6464713627. The reversal of 6464713621 is 1263174646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6464713621 - 2¹⁷ = 6464582549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6464713627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48244065 + ... + 48244198.

It is an arithmetic number, because the mean of its divisors is an integer number (1640300488).

Almost surely, 2^6464713621 is an apocalyptic number.

It is an amenable number.

6464713621 is a deficient number, since it is larger than the sum of its proper divisors (96488331).

6464713621 is an equidigital number, since it uses as much as digits as its factorization.

6464713621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96488330.

The product of its digits is 145152, while the sum is 40.

The square root of 6464713621 is about 80403.4428429529. The cubic root of 6464713621 is about 1862.8723513371.

The spelling of 6464713621 in words is "six billion, four hundred sixty-four million, seven hundred thirteen thousand, six hundred twenty-one".