664364457 has 16 divisors (see below), whose sum is σ = 986534080. Its totient is φ = 441878976.

The previous prime is 664364423. The next prime is 664364473. The reversal of 664364457 is 754463466.

It is a happy number.

It is not a de Polignac number, because 664364457 - 2¹⁰ = 664363433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664364417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16723 + ... + 40104.

It is an arithmetic number, because the mean of its divisors is an integer number (61658380).

Almost surely, 2^664364457 is an apocalyptic number.

It is an amenable number.

664364457 is a deficient number, since it is larger than the sum of its proper divisors (322169623).

664364457 is a wasteful number, since it uses less digits than its factorization.

664364457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57269 (or 57263 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 45.

The square root of 664364457 is about 25775.2683206208. The cubic root of 664364457 is about 872.5737222841.

Subtracting 664364457 from its reverse (754463466), we obtain a palindrome (90099009).

The spelling of 664364457 in words is "six hundred sixty-four million, three hundred sixty-four thousand, four hundred fifty-seven".