665577620954 has 16 divisors (see below), whose sum is σ = 1066791983400. Its totient is φ = 310339482624.

The previous prime is 665577620941. The next prime is 665577620999. The reversal of 665577620954 is 459026775566.

It can be written as a sum of positive squares in 4 ways, for example, as 649921355329 + 15656265625 = 806177^2 + 125125^2 .

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, 89793599 + ... + 89801010.

Almost surely, 2^665577620954 is an apocalyptic number.

665577620954 is a deficient number, since it is larger than the sum of its proper divisors (401214362446).

665577620954 is a wasteful number, since it uses less digits than its factorization.

665577620954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179594737.

The product of its (nonzero) digits is 95256000, while the sum is 62.

The spelling of 665577620954 in words is "six hundred sixty-five billion, five hundred seventy-seven million, six hundred twenty thousand, nine hundred fifty-four".