665362107581 has 4 divisors (see below), whose sum is σ = 666799175232. Its totient is φ = 663925039932.

The previous prime is 665362107511. The next prime is 665362107703. The reversal of 665362107581 is 185701263566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665362107581 is a prime.

It is a super-2 number, since 2×665362107581² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665362107511) 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, 718533131 + ... + 718534056.

It is an arithmetic number, because the mean of its divisors is an integer number (166699793808).

Almost surely, 2^665362107581 is an apocalyptic number.

It is an amenable number.

665362107581 is a deficient number, since it is larger than the sum of its proper divisors (1437067651).

665362107581 is a wasteful number, since it uses less digits than its factorization.

665362107581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437067650.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 665362107581 in words is "six hundred sixty-five billion, three hundred sixty-two million, one hundred seven thousand, five hundred eighty-one".