657801346879 has 4 divisors (see below), whose sum is σ = 659944022584. Its totient is φ = 655658671176.

The previous prime is 657801346859. The next prime is 657801346883. The reversal of 657801346879 is 978643108756.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 657801346879 - 2²³ = 657792958271 is a prime.

It is a super-2 number, since 2×657801346879² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 657801346879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657801346859) 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, 1071337392 + ... + 1071338005.

It is an arithmetic number, because the mean of its divisors is an integer number (164986005646).

Almost surely, 2^657801346879 is an apocalyptic number.

657801346879 is a deficient number, since it is larger than the sum of its proper divisors (2142675705).

657801346879 is a wasteful number, since it uses less digits than its factorization.

657801346879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142675704.

The product of its (nonzero) digits is 60963840, while the sum is 64.

The spelling of 657801346879 in words is "six hundred fifty-seven billion, eight hundred one million, three hundred forty-six thousand, eight hundred seventy-nine".