665557437604 has 6 divisors (see below), whose sum is σ = 1164725515814. Its totient is φ = 332778718800.

The previous prime is 665557437583. The next prime is 665557437613. The reversal of 665557437604 is 406734755566.

It can be written as a sum of positive squares in only one way, i.e., 638004757504 + 27552680100 = 798752^2 + 165990^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83194679697 + ... + 83194679704.

Almost surely, 2^665557437604 is an apocalyptic number.

It is an amenable number.

665557437604 is a deficient number, since it is larger than the sum of its proper divisors (499168078210).

665557437604 is a wasteful number, since it uses less digits than its factorization.

665557437604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166389359405 (or 166389359403 counting only the distinct ones).

The product of its (nonzero) digits is 63504000, while the sum is 58.

The spelling of 665557437604 in words is "six hundred sixty-five billion, five hundred fifty-seven million, four hundred thirty-seven thousand, six hundred four".