646231818239 has 32 divisors (see below), whose sum is σ = 783510773760. Its totient is φ = 520320402432.

The previous prime is 646231818233. The next prime is 646231818241. The reversal of 646231818239 is 932818132646.

It is not a de Polignac number, because 646231818239 - 2⁴ = 646231818223 is a prime.

It is a super-2 number, since 2×646231818239² (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 (646231818233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175939307 + ... + 175942979.

It is an arithmetic number, because the mean of its divisors is an integer number (24484711680).

Almost surely, 2^646231818239 is an apocalyptic number.

646231818239 is a deficient number, since it is larger than the sum of its proper divisors (137278955521).

646231818239 is a wasteful number, since it uses less digits than its factorization.

646231818239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6159.

The product of its digits is 2985984, while the sum is 53.

The spelling of 646231818239 in words is "six hundred forty-six billion, two hundred thirty-one million, eight hundred eighteen thousand, two hundred thirty-nine".