664345076 has 6 divisors (see below), whose sum is σ = 1162603890. Its totient is φ = 332172536.

The previous prime is 664345037. The next prime is 664345093. The reversal of 664345076 is 670543466.

It can be written as a sum of positive squares in only one way, i.e., 505080676 + 159264400 = 22474^2 + 12620^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83043131 + ... + 83043138.

It is an arithmetic number, because the mean of its divisors is an integer number (193767315).

Almost surely, 2^664345076 is an apocalyptic number.

It is an amenable number.

664345076 is a deficient number, since it is larger than the sum of its proper divisors (498258814).

664345076 is a wasteful number, since it uses less digits than its factorization.

664345076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166086273 (or 166086271 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 41.

The square root of 664345076 is about 25774.8923567102. The cubic root of 664345076 is about 872.5652372246.

The spelling of 664345076 in words is "six hundred sixty-four million, three hundred forty-five thousand, seventy-six".