646843513131 has 16 divisors (see below), whose sum is σ = 972589475200. Its totient is φ = 424792753704.

The previous prime is 646843513117. The next prime is 646843513153. The reversal of 646843513131 is 131315348646.

646843513131 is a `hidden beast` number, since 6 + 4 + 68 + 43 + 513 + 1 + 31 = 666.

646843513131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646843513131 - 2⁶ = 646843513067 is a prime.

It is a super-2 number, since 2×646843513131² (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 (646843511131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178783021 + ... + 178786638.

It is an arithmetic number, because the mean of its divisors is an integer number (60786842200).

Almost surely, 2^646843513131 is an apocalyptic number.

646843513131 is a deficient number, since it is larger than the sum of its proper divisors (325745962069).

646843513131 is a wasteful number, since it uses less digits than its factorization.

646843513131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357569735 (or 357569729 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 646843513131 in words is "six hundred forty-six billion, eight hundred forty-three million, five hundred thirteen thousand, one hundred thirty-one".