665577504037 has 4 divisors (see below), whose sum is σ = 666612617440. Its totient is φ = 664542390636.

The previous prime is 665577504029. The next prime is 665577504049. The reversal of 665577504037 is 730405775566.

It is a happy number.

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 not a de Polignac number, because 665577504037 - 2³ = 665577504029 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 (665577504637) 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, 517555737 + ... + 517557022.

It is an arithmetic number, because the mean of its divisors is an integer number (166653154360).

Almost surely, 2^665577504037 is an apocalyptic number.

It is an amenable number.

665577504037 is a deficient number, since it is larger than the sum of its proper divisors (1035113403).

665577504037 is a wasteful number, since it uses less digits than its factorization.

665577504037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035113402.

The product of its (nonzero) digits is 18522000, while the sum is 55.

The spelling of 665577504037 in words is "six hundred sixty-five billion, five hundred seventy-seven million, five hundred four thousand, thirty-seven".