136681971681 has 16 divisors (see below), whose sum is σ = 183696408000. Its totient is φ = 90395963328.

The previous prime is 136681971667. The next prime is 136681971697. The reversal of 136681971681 is 186179186631.

It is a happy number.

It is not a de Polignac number, because 136681971681 - 2⁷ = 136681971553 is a prime.

It is a super-2 number, since 2×136681971681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (136681971661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164430 + ... + 548088.

It is an arithmetic number, because the mean of its divisors is an integer number (11481025500).

Almost surely, 2^136681971681 is an apocalyptic number.

It is an amenable number.

136681971681 is a deficient number, since it is larger than the sum of its proper divisors (47014436319).

136681971681 is a wasteful number, since it uses less digits than its factorization.

136681971681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384608.

The product of its digits is 2612736, while the sum is 57.

The spelling of 136681971681 in words is "one hundred thirty-six billion, six hundred eighty-one million, nine hundred seventy-one thousand, six hundred eighty-one".