261646244226331 has 4 divisors (see below), whose sum is σ = 261646426029112. Its totient is φ = 261646062423552.

The previous prime is 261646244226271. The next prime is 261646244226379. The reversal of 261646244226331 is 133622442646162.

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 261646244226331 - 2⁷ = 261646244226203 is a prime.

It is a super-2 number, since 2×261646244226331² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261646244224331) 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, 88725261 + ... + 91626766.

It is an arithmetic number, because the mean of its divisors is an integer number (65411606507278).

Almost surely, 2^{261646244226331} is an apocalyptic number.

261646244226331 is a deficient number, since it is larger than the sum of its proper divisors (181802781).

261646244226331 is a wasteful number, since it uses less digits than its factorization.

261646244226331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181802780.

The product of its digits is 11943936, while the sum is 52.

The spelling of 261646244226331 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred forty-four million, two hundred twenty-six thousand, three hundred thirty-one".