136177715521 has 4 divisors (see below), whose sum is σ = 136178455252. Its totient is φ = 136176975792.

The previous prime is 136177715473. The next prime is 136177715549. The reversal of 136177715521 is 125517771631.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 125199914896 + 10977800625 = 353836^2 + 104775^2 .

It is a cyclic number.

It is not a de Polignac number, because 136177715521 - 2²⁵ = 136144161089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136177715581) 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, 147511 + ... + 542323.

It is an arithmetic number, because the mean of its divisors is an integer number (34044613813).

Almost surely, 2^136177715521 is an apocalyptic number.

It is an amenable number.

136177715521 is a deficient number, since it is larger than the sum of its proper divisors (739731).

136177715521 is an equidigital number, since it uses as much as digits as its factorization.

136177715521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739730.

The product of its digits is 308700, while the sum is 46.

The spelling of 136177715521 in words is "one hundred thirty-six billion, one hundred seventy-seven million, seven hundred fifteen thousand, five hundred twenty-one".