664465214577021 has 64 divisors (see below), whose sum is σ = 1046388309657600. Its totient is φ = 369748605600000.

The previous prime is 664465214577011. The next prime is 664465214577089. The reversal of 664465214577021 is 120775412564466.

It is not a de Polignac number, because 664465214577021 - 2²⁷ = 664465080359293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664465214577011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 280630746 + ... + 282988596.

It is an arithmetic number, because the mean of its divisors is an integer number (16349817338400).

Almost surely, 2^{664465214577021} is an apocalyptic number.

It is an amenable number.

664465214577021 is a deficient number, since it is larger than the sum of its proper divisors (381923095080579).

664465214577021 is a wasteful number, since it uses less digits than its factorization.

664465214577021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361378.

The product of its (nonzero) digits is 67737600, while the sum is 60.

The spelling of 664465214577021 in words is "six hundred sixty-four trillion, four hundred sixty-five billion, two hundred fourteen million, five hundred seventy-seven thousand, twenty-one".