664715454719 has 4 divisors (see below), whose sum is σ = 666852803760. Its totient is φ = 662578105680.

The previous prime is 664715454709. The next prime is 664715454731. The reversal of 664715454719 is 917454517466.

664715454719 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.

It is a cyclic number.

It is not a de Polignac number, because 664715454719 - 2²⁰ = 664714406143 is a prime.

It is a super-2 number, since 2×664715454719² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664715454709) 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, 1068674054 + ... + 1068674675.

It is an arithmetic number, because the mean of its divisors is an integer number (166713200940).

Almost surely, 2^664715454719 is an apocalyptic number.

664715454719 is a deficient number, since it is larger than the sum of its proper divisors (2137349041).

664715454719 is a wasteful number, since it uses less digits than its factorization.

664715454719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137349040.

The product of its digits is 25401600, while the sum is 59.

The spelling of 664715454719 in words is "six hundred sixty-four billion, seven hundred fifteen million, four hundred fifty-four thousand, seven hundred nineteen".