665873737677 has 6 divisors (see below), whose sum is σ = 961817621102. Its totient is φ = 443915825112.

The previous prime is 665873737663. The next prime is 665873737729. The reversal of 665873737677 is 776737378566.

665873737677 is a `hidden beast` number, since 6 + 6 + 587 + 3 + 7 + 37 + 6 + 7 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 661661857476 + 4211880201 = 813426^2 + 64899^2 .

It is not a de Polignac number, because 665873737677 - 2¹⁰ = 665873736653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665873737777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36992985418 + ... + 36992985435.

Almost surely, 2^665873737677 is an apocalyptic number.

It is an amenable number.

665873737677 is a deficient number, since it is larger than the sum of its proper divisors (295943883425).

665873737677 is a wasteful number, since it uses less digits than its factorization.

665873737677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73985970859 (or 73985970856 counting only the distinct ones).

The product of its digits is 1306912320, while the sum is 72.

The spelling of 665873737677 in words is "six hundred sixty-five billion, eight hundred seventy-three million, seven hundred thirty-seven thousand, six hundred seventy-seven".