261562670065135 has 4 divisors (see below), whose sum is σ = 313875204078168. Its totient is φ = 209250136052104.

The previous prime is 261562670065051. The next prime is 261562670065153. The reversal of 261562670065135 is 531560076265162.

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 261562670065135 - 2⁷ = 261562670065007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26156267006509 + ... + 26156267006518.

It is an arithmetic number, because the mean of its divisors is an integer number (78468801019542).

Almost surely, 2^{261562670065135} is an apocalyptic number.

261562670065135 is a deficient number, since it is larger than the sum of its proper divisors (52312534013033).

261562670065135 is an equidigital number, since it uses as much as digits as its factorization.

261562670065135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52312534013032.

The product of its (nonzero) digits is 13608000, while the sum is 55.

The spelling of 261562670065135 in words is "two hundred sixty-one trillion, five hundred sixty-two billion, six hundred seventy million, sixty-five thousand, one hundred thirty-five".