646124626627631 has 4 divisors (see below), whose sum is σ = 653384453893200. Its totient is φ = 638864799362064.

The previous prime is 646124626627583. The next prime is 646124626627637. The reversal of 646124626627631 is 136726626421646.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646124626627631 is a prime.

It is a super-2 number, since 2×646124626627631² (a number of 30 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 (646124626627637) 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, 3629913632651 + ... + 3629913632828.

It is an arithmetic number, because the mean of its divisors is an integer number (163346113473300).

Almost surely, 2^{646124626627631} is an apocalyptic number.

646124626627631 is a deficient number, since it is larger than the sum of its proper divisors (7259827265569).

646124626627631 is an equidigital number, since it uses as much as digits as its factorization.

646124626627631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7259827265568.

The product of its digits is 125411328, while the sum is 62.

The spelling of 646124626627631 in words is "six hundred forty-six trillion, one hundred twenty-four billion, six hundred twenty-six million, six hundred twenty-seven thousand, six hundred thirty-one".