664577734552756 has 24 divisors (see below), whose sum is σ = 1231470820499976. Its totient is φ = 312730432542720.

The previous prime is 664577734552709. The next prime is 664577734552847. The reversal of 664577734552756 is 657255437775466.

It can be written as a sum of positive squares in 4 ways, for example, as 65961750995856 + 598615983556900 = 8121684^2 + 24466630^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186200085 + ... + 189735676.

It is an arithmetic number, because the mean of its divisors is an integer number (51311284187499).

Almost surely, 2^{664577734552756} is an apocalyptic number.

It is an amenable number.

664577734552756 is a deficient number, since it is larger than the sum of its proper divisors (566893085947220).

664577734552756 is a wasteful number, since it uses less digits than its factorization.

664577734552756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375961779 (or 375961777 counting only the distinct ones).

The product of its digits is 31116960000, while the sum is 79.

The spelling of 664577734552756 in words is "six hundred sixty-four trillion, five hundred seventy-seven billion, seven hundred thirty-four million, five hundred fifty-two thousand, seven hundred fifty-six".