664775544372452 has 6 divisors (see below), whose sum is σ = 1163357202651798. Its totient is φ = 332387772186224.

The previous prime is 664775544372403. The next prime is 664775544372469. The reversal of 664775544372452 is 254273445577466.

It can be written as a sum of positive squares in only one way, i.e., 532640887212196 + 132134657160256 = 23079014^2 + 11494984^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83096943046553 + ... + 83096943046560.

It is an arithmetic number, because the mean of its divisors is an integer number (193892867108633).

Almost surely, 2^{664775544372452} is an apocalyptic number.

It is an amenable number.

664775544372452 is a deficient number, since it is larger than the sum of its proper divisors (498581658279346).

664775544372452 is a wasteful number, since it uses less digits than its factorization.

664775544372452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166193886093117 (or 166193886093115 counting only the distinct ones).

The product of its digits is 4741632000, while the sum is 71.

The spelling of 664775544372452 in words is "six hundred sixty-four trillion, seven hundred seventy-five billion, five hundred forty-four million, three hundred seventy-two thousand, four hundred fifty-two".