656212320201 has 4 divisors (see below), whose sum is σ = 874949760272. Its totient is φ = 437474880132.

The previous prime is 656212320163. The next prime is 656212320229. The reversal of 656212320201 is 102023212656.

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 not a de Polignac number, because 656212320201 - 2¹⁵ = 656212287433 is a prime.

It is a super-2 number, since 2×656212320201² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656212320251) 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, 109368720031 + ... + 109368720036.

It is an arithmetic number, because the mean of its divisors is an integer number (218737440068).

Almost surely, 2^656212320201 is an apocalyptic number.

It is an amenable number.

656212320201 is a deficient number, since it is larger than the sum of its proper divisors (218737440071).

656212320201 is a wasteful number, since it uses less digits than its factorization.

656212320201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218737440070.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 656212320201 its reverse (102023212656), we get a palindrome (758235532857).

The spelling of 656212320201 in words is "six hundred fifty-six billion, two hundred twelve million, three hundred twenty thousand, two hundred one".