664465257571051 has 4 divisors (see below), whose sum is σ = 693355051378512. Its totient is φ = 635575463763592.

The previous prime is 664465257571033. The next prime is 664465257571079. The reversal of 664465257571051 is 150175752564466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664465257571051 - 2⁵ = 664465257571019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664465257571001) 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, 14444896903696 + ... + 14444896903741.

It is an arithmetic number, because the mean of its divisors is an integer number (173338762844628).

Almost surely, 2^{664465257571051} is an apocalyptic number.

664465257571051 is a deficient number, since it is larger than the sum of its proper divisors (28889793807461).

664465257571051 is a wasteful number, since it uses less digits than its factorization.

664465257571051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28889793807460.

The product of its (nonzero) digits is 211680000, while the sum is 64.

The spelling of 664465257571051 in words is "six hundred sixty-four trillion, four hundred sixty-five billion, two hundred fifty-seven million, five hundred seventy-one thousand, fifty-one".