664614646271 has 4 divisors (see below), whose sum is σ = 665323947792. Its totient is φ = 663905344752.

The previous prime is 664614646249. The next prime is 664614646277. The reversal of 664614646271 is 172646416466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 172646416466 = 2 ⋅86323208233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664614646271 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 (664614646277) 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, 354649355 + ... + 354651228.

It is an arithmetic number, because the mean of its divisors is an integer number (166330986948).

Almost surely, 2^664614646271 is an apocalyptic number.

664614646271 is a deficient number, since it is larger than the sum of its proper divisors (709301521).

664614646271 is an equidigital number, since it uses as much as digits as its factorization.

664614646271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709301520.

The product of its digits is 6967296, while the sum is 53.

The spelling of 664614646271 in words is "six hundred sixty-four billion, six hundred fourteen million, six hundred forty-six thousand, two hundred seventy-one".