215139625261 has 16 divisors (see below), whose sum is σ = 238658349888. Its totient is φ = 192292214400.

The previous prime is 215139625237. The next prime is 215139625297. The reversal of 215139625261 is 162526931512.

It is not a de Polignac number, because 215139625261 - 2⁵ = 215139625229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215139625661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103831 + ... + 664123.

It is an arithmetic number, because the mean of its divisors is an integer number (14916146868).

Almost surely, 2^215139625261 is an apocalyptic number.

It is an amenable number.

215139625261 is a deficient number, since it is larger than the sum of its proper divisors (23518724627).

215139625261 is a wasteful number, since it uses less digits than its factorization.

215139625261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560892.

The product of its digits is 194400, while the sum is 43.

The spelling of 215139625261 in words is "two hundred fifteen billion, one hundred thirty-nine million, six hundred twenty-five thousand, two hundred sixty-one".