136651440452521 has 4 divisors (see below), whose sum is σ = 136651804714692. Its totient is φ = 136651076190352.

The previous prime is 136651440452519. The next prime is 136651440452561. The reversal of 136651440452521 is 125254044156631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61201456874496 + 75449983578025 = 7823136^2 + 8686195^2 .

It is a cyclic number.

It is not a de Polignac number, because 136651440452521 - 2¹ = 136651440452519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136651440452561) 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, 181567786 + ... + 182318851.

It is an arithmetic number, because the mean of its divisors is an integer number (34162951178673).

Almost surely, 2^{136651440452521} is an apocalyptic number.

It is an amenable number.

136651440452521 is a deficient number, since it is larger than the sum of its proper divisors (364262171).

136651440452521 is an equidigital number, since it uses as much as digits as its factorization.

136651440452521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364262170.

The product of its (nonzero) digits is 3456000, while the sum is 49.

The spelling of 136651440452521 in words is "one hundred thirty-six trillion, six hundred fifty-one billion, four hundred forty million, four hundred fifty-two thousand, five hundred twenty-one".