261421053316670 has 32 divisors (see below), whose sum is σ = 506763285759360. Its totient is φ = 96523053073920.

The previous prime is 261421053316613. The next prime is 261421053316673. The reversal of 261421053316670 is 76613350124162.

261421053316670 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261421053316673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9442715 + ... + 24738774.

It is an arithmetic number, because the mean of its divisors is an integer number (15836352679980).

Almost surely, 2^{261421053316670} is an apocalyptic number.

261421053316670 is a deficient number, since it is larger than the sum of its proper divisors (245342232442690).

261421053316670 is a wasteful number, since it uses less digits than its factorization.

261421053316670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34240340.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 261421053316670 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, fifty-three million, three hundred sixteen thousand, six hundred seventy".