261656277414251 has 4 divisors (see below), whose sum is σ = 261656702008632. Its totient is φ = 261655852819872.

The previous prime is 261656277414239. The next prime is 261656277414293. The reversal of 261656277414251 is 152414772656162.

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

It is a cyclic number.

It is not a de Polignac number, because 261656277414251 - 2³⁸ = 261381399507307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261656277414451) 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, 211371470 + ... + 212605763.

It is an arithmetic number, because the mean of its divisors is an integer number (65414175502158).

Almost surely, 2^{261656277414251} is an apocalyptic number.

261656277414251 is a deficient number, since it is larger than the sum of its proper divisors (424594381).

261656277414251 is an equidigital number, since it uses as much as digits as its factorization.

261656277414251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424594380.

The product of its digits is 33868800, while the sum is 59.

The spelling of 261656277414251 in words is "two hundred sixty-one trillion, six hundred fifty-six billion, two hundred seventy-seven million, four hundred fourteen thousand, two hundred fifty-one".