265279012639 has 4 divisors (see below), whose sum is σ = 265629448024. Its totient is φ = 264928577256.

The previous prime is 265279012573. The next prime is 265279012673. The reversal of 265279012639 is 936210972562.

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 265279012639 - 2¹⁵ = 265278979871 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 (265279012699) 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, 175216557 + ... + 175218070.

It is an arithmetic number, because the mean of its divisors is an integer number (66407362006).

Almost surely, 2^265279012639 is an apocalyptic number.

265279012639 is a deficient number, since it is larger than the sum of its proper divisors (350435385).

265279012639 is an equidigital number, since it uses as much as digits as its factorization.

265279012639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350435384.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 265279012639 in words is "two hundred sixty-five billion, two hundred seventy-nine million, twelve thousand, six hundred thirty-nine".