656242212413 has 4 divisors (see below), whose sum is σ = 656245596828. Its totient is φ = 656238828000.

The previous prime is 656242212389. The next prime is 656242212419. The reversal of 656242212413 is 314212242656.

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

It can be written as a sum of positive squares in 2 ways, for example, as 429972652729 + 226269559684 = 655723^2 + 475678^2 .

It is a cyclic number.

It is not a de Polignac number, because 656242212413 - 2⁶ = 656242212349 is a prime.

It is a super-2 number, since 2×656242212413² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656242212419) 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, 1382456 + ... + 1795457.

It is an arithmetic number, because the mean of its divisors is an integer number (164061399207).

Almost surely, 2^656242212413 is an apocalyptic number.

It is an amenable number.

656242212413 is a deficient number, since it is larger than the sum of its proper divisors (3384415).

656242212413 is a wasteful number, since it uses less digits than its factorization.

656242212413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3384414.

The product of its digits is 138240, while the sum is 38.

The spelling of 656242212413 in words is "six hundred fifty-six billion, two hundred forty-two million, two hundred twelve thousand, four hundred thirteen".