265944142591 has 4 divisors (see below), whose sum is σ = 267575701912. Its totient is φ = 264312583272.

The previous prime is 265944142589. The next prime is 265944142613. The reversal of 265944142591 is 195241449562.

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 265944142591 - 2¹ = 265944142589 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 (265944112591) 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, 815779416 + ... + 815779741.

It is an arithmetic number, because the mean of its divisors is an integer number (66893925478).

Almost surely, 2^265944142591 is an apocalyptic number.

265944142591 is a deficient number, since it is larger than the sum of its proper divisors (1631559321).

265944142591 is a wasteful number, since it uses less digits than its factorization.

265944142591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631559320.

The product of its digits is 3110400, while the sum is 52.

The spelling of 265944142591 in words is "two hundred sixty-five billion, nine hundred forty-four million, one hundred forty-two thousand, five hundred ninety-one".