136566642631 has 4 divisors (see below), whose sum is σ = 136971885232. Its totient is φ = 136161400032.

The previous prime is 136566642629. The next prime is 136566642637. The reversal of 136566642631 is 136246665631.

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 136566642631 - 2¹ = 136566642629 is a prime.

It is a super-2 number, since 2×136566642631² (a number of 23 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 (136566642637) 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, 202620795 + ... + 202621468.

It is an arithmetic number, because the mean of its divisors is an integer number (34242971308).

Almost surely, 2^136566642631 is an apocalyptic number.

136566642631 is a deficient number, since it is larger than the sum of its proper divisors (405242601).

136566642631 is an equidigital number, since it uses as much as digits as its factorization.

136566642631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405242600.

The product of its digits is 2799360, while the sum is 49.

The spelling of 136566642631 in words is "one hundred thirty-six billion, five hundred sixty-six million, six hundred forty-two thousand, six hundred thirty-one".