657211813023 has 4 divisors (see below), whose sum is σ = 876282417368. Its totient is φ = 438141208680.

The previous prime is 657211813009. The next prime is 657211813033. The reversal of 657211813023 is 320318112756.

It is a happy number.

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

It is not a de Polignac number, because 657211813023 - 2²⁶ = 657144704159 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 (657211813003) 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, 109535302168 + ... + 109535302173.

It is an arithmetic number, because the mean of its divisors is an integer number (219070604342).

Almost surely, 2^657211813023 is an apocalyptic number.

657211813023 is a deficient number, since it is larger than the sum of its proper divisors (219070604345).

657211813023 is a wasteful number, since it uses less digits than its factorization.

657211813023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219070604344.

The product of its (nonzero) digits is 60480, while the sum is 39.

Adding to 657211813023 its reverse (320318112756), we get a palindrome (977529925779).

The spelling of 657211813023 in words is "six hundred fifty-seven billion, two hundred eleven million, eight hundred thirteen thousand, twenty-three".