636346213421231 has 4 divisors (see below), whose sum is σ = 636377189745792. Its totient is φ = 636315237096672.

The previous prime is 636346213421141. The next prime is 636346213421251. The reversal of 636346213421231 is 132124312643636.

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

It is a cyclic number.

It is not a de Polignac number, because 636346213421231 - 2³⁰ = 636345139679407 is a prime.

It is a super-2 number, since 2×636346213421231² (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 (636346213421251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15488131466 + ... + 15488172551.

It is an arithmetic number, because the mean of its divisors is an integer number (159094297436448).

Almost surely, 2^{636346213421231} is an apocalyptic number.

636346213421231 is a deficient number, since it is larger than the sum of its proper divisors (30976324561).

636346213421231 is a wasteful number, since it uses less digits than its factorization.

636346213421231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30976324560.

The product of its digits is 2239488, while the sum is 47.

The spelling of 636346213421231 in words is "six hundred thirty-six trillion, three hundred forty-six billion, two hundred thirteen million, four hundred twenty-one thousand, two hundred thirty-one".