255694394239 has 4 divisors (see below), whose sum is σ = 255697048656. Its totient is φ = 255691739824.

The previous prime is 255694394213. The next prime is 255694394273. The reversal of 255694394239 is 932493496552.

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 255694394239 - 2¹⁵ = 255694361471 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 (255694397239) 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, 1177054 + ... + 1377259.

It is an arithmetic number, because the mean of its divisors is an integer number (63924262164).

Almost surely, 2^255694394239 is an apocalyptic number.

255694394239 is a deficient number, since it is larger than the sum of its proper divisors (2654417).

255694394239 is a wasteful number, since it uses less digits than its factorization.

255694394239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654416.

The product of its digits is 62985600, while the sum is 61.

The spelling of 255694394239 in words is "two hundred fifty-five billion, six hundred ninety-four million, three hundred ninety-four thousand, two hundred thirty-nine".