136687018462721 has 4 divisors (see below), whose sum is σ = 136692754167744. Its totient is φ = 136681282757700.

The previous prime is 136687018462703. The next prime is 136687018462727. The reversal of 136687018462721 is 127264810786631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 136687018462721 - 2²² = 136687014268417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136687018462727) 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, 2867816765 + ... + 2867864426.

It is an arithmetic number, because the mean of its divisors is an integer number (34173188541936).

Almost surely, 2^{136687018462721} is an apocalyptic number.

It is an amenable number.

136687018462721 is a deficient number, since it is larger than the sum of its proper divisors (5735705023).

136687018462721 is an equidigital number, since it uses as much as digits as its factorization.

136687018462721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5735705022.

The product of its (nonzero) digits is 32514048, while the sum is 62.

The spelling of 136687018462721 in words is "one hundred thirty-six trillion, six hundred eighty-seven billion, eighteen million, four hundred sixty-two thousand, seven hundred twenty-one".