665434658131 has 4 divisors (see below), whose sum is σ = 665641510792. Its totient is φ = 665227805472.

The previous prime is 665434658069. The next prime is 665434658137. The reversal of 665434658131 is 131856434566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131856434566 = 2 ⋅65928217283.

It is a cyclic number.

It is not a de Polignac number, because 665434658131 - 2¹⁷ = 665434527059 is a prime.

It is a super-2 number, since 2×665434658131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665434658137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103421505 + ... + 103427938.

It is an arithmetic number, because the mean of its divisors is an integer number (166410377698).

Almost surely, 2^665434658131 is an apocalyptic number.

665434658131 is a deficient number, since it is larger than the sum of its proper divisors (206852661).

665434658131 is a wasteful number, since it uses less digits than its factorization.

665434658131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206852660.

The product of its digits is 6220800, while the sum is 52.

The spelling of 665434658131 in words is "six hundred sixty-five billion, four hundred thirty-four million, six hundred fifty-eight thousand, one hundred thirty-one".