139604126145561 has 135 divisors (see below), whose sum is σ = 258610263182453. Its totient is φ = 72511699019760.

The previous prime is 139604126145481. The next prime is 139604126145619. The reversal of 139604126145561 is 165541621406931.

The square root of 139604126145561 is 11815419.

It is a perfect power (a square), and thus also a powerful number.

139604126145561 is a `hidden beast` number, since 1 + 3 + 9 + 6 + 0 + 4 + 12 + 61 + 4 + 5 + 561 = 666.

It is not a de Polignac number, because 139604126145561 - 2²³ = 139604117756953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139604126145498 and 139604126145507.

It is not an unprimeable number, because it can be changed into a prime (139604126145061) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 19105528870 + ... + 19105536176.

Almost surely, 2^{139604126145561} is an apocalyptic number.

139604126145561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

139604126145561 is the 11815419-th square number.

139604126145561 is the 5907710-th centered octagonal number.

It is an amenable number.

139604126145561 is a deficient number, since it is larger than the sum of its proper divisors (119006137036892).

139604126145561 is an frugal number, since it uses more digits than its factorization.

139604126145561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14670 (or 7328 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 139604126145561 in words is "one hundred thirty-nine trillion, six hundred four billion, one hundred twenty-six million, one hundred forty-five thousand, five hundred sixty-one".