665213618873 has 8 divisors (see below), whose sum is σ = 678292794816. Its totient is φ = 652204573200.

The previous prime is 665213618831. The next prime is 665213618887. The reversal of 665213618873 is 378816312566.

665213618873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665213618873 - 2²⁶ = 665146510009 is a prime.

It is a super-2 number, since 2×665213618873² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (665213618813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17513411 + ... + 17551352.

It is an arithmetic number, because the mean of its divisors is an integer number (84786599352).

Almost surely, 2^665213618873 is an apocalyptic number.

It is an amenable number.

665213618873 is a deficient number, since it is larger than the sum of its proper divisors (13079175943).

665213618873 is a wasteful number, since it uses less digits than its factorization.

665213618873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35065135.

The product of its digits is 8709120, while the sum is 56.

The spelling of 665213618873 in words is "six hundred sixty-five billion, two hundred thirteen million, six hundred eighteen thousand, eight hundred seventy-three".