136966002721 has 4 divisors (see below), whose sum is σ = 137126573332. Its totient is φ = 136805432112.

The previous prime is 136966002703. The next prime is 136966002757. The reversal of 136966002721 is 127200669631.

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 15469140625 + 121496862096 = 124375^2 + 348564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136966002721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136966002521) 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, 80284026 + ... + 80285731.

It is an arithmetic number, because the mean of its divisors is an integer number (34281643333).

Almost surely, 2^136966002721 is an apocalyptic number.

It is an amenable number.

136966002721 is a deficient number, since it is larger than the sum of its proper divisors (160570611).

136966002721 is an equidigital number, since it uses as much as digits as its factorization.

136966002721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160570610.

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 136966002721 in words is "one hundred thirty-six billion, nine hundred sixty-six million, two thousand, seven hundred twenty-one".