136620642531 has 32 divisors (see below), whose sum is σ = 194768179200. Its totient is φ = 84994842240.

The previous prime is 136620642493. The next prime is 136620642533. The reversal of 136620642531 is 135246026631.

It is not a de Polignac number, because 136620642531 - 2²⁶ = 136553533667 is a prime.

It is a super-2 number, since 2×136620642531² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 136620642531.

It is not an unprimeable number, because it can be changed into a prime (136620642533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2117730 + ... + 2181288.

It is an arithmetic number, because the mean of its divisors is an integer number (6086505600).

Almost surely, 2^136620642531 is an apocalyptic number.

136620642531 is a deficient number, since it is larger than the sum of its proper divisors (58147536669).

136620642531 is a wasteful number, since it uses less digits than its factorization.

136620642531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64419.

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 136620642531 in words is "one hundred thirty-six billion, six hundred twenty million, six hundred forty-two thousand, five hundred thirty-one".