665664101738 has 16 divisors (see below), whose sum is σ = 1014900941736. Its totient is φ = 327364175040.

The previous prime is 665664101701. The next prime is 665664101849. The reversal of 665664101738 is 837101466566.

It can be written as a sum of positive squares in 4 ways, for example, as 302437303249 + 363226798489 = 549943^2 + 602683^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 665664101738.

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, 4099220 + ... + 4258512.

Almost surely, 2^665664101738 is an apocalyptic number.

665664101738 is a deficient number, since it is larger than the sum of its proper divisors (349236839998).

665664101738 is a wasteful number, since it uses less digits than its factorization.

665664101738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193609.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 665664101738 in words is "six hundred sixty-five billion, six hundred sixty-four million, one hundred one thousand, seven hundred thirty-eight".