646442451213 has 64 divisors (see below), whose sum is σ = 985076951040. Its totient is φ = 374042592000.

The previous prime is 646442451181. The next prime is 646442451227. The reversal of 646442451213 is 312154244646.

It is not a de Polignac number, because 646442451213 - 2⁵ = 646442451181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646442451253) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 127980538 + ... + 127985588.

It is an arithmetic number, because the mean of its divisors is an integer number (15391827360).

Almost surely, 2^646442451213 is an apocalyptic number.

It is an amenable number.

646442451213 is a deficient number, since it is larger than the sum of its proper divisors (338634499827).

646442451213 is a wasteful number, since it uses less digits than its factorization.

646442451213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7490.

The product of its digits is 552960, while the sum is 42.

Adding to 646442451213 its reverse (312154244646), we get a palindrome (958596695859).

The spelling of 646442451213 in words is "six hundred forty-six billion, four hundred forty-two million, four hundred fifty-one thousand, two hundred thirteen".