64604163621 has 4 divisors (see below), whose sum is σ = 86138884832. Its totient is φ = 43069442412.

The previous prime is 64604163601. The next prime is 64604163671. The reversal of 64604163621 is 12636140646.

64604163621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 64604163621 - 2¹⁸ = 64603901477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64604163621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64604163601) 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, 10767360601 + ... + 10767360606.

It is an arithmetic number, because the mean of its divisors is an integer number (21534721208).

Almost surely, 2^64604163621 is an apocalyptic number.

It is an amenable number.

64604163621 is a deficient number, since it is larger than the sum of its proper divisors (21534721211).

64604163621 is a wasteful number, since it uses less digits than its factorization.

64604163621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21534721210.

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 64604163621 in words is "sixty-four billion, six hundred four million, one hundred sixty-three thousand, six hundred twenty-one".