255218639894 has 4 divisors (see below), whose sum is σ = 382827959844. Its totient is φ = 127609319946.

The previous prime is 255218639857. The next prime is 255218639899. The reversal of 255218639894 is 498936812552.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255218639899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63804659972 + ... + 63804659975.

It is an arithmetic number, because the mean of its divisors is an integer number (95706989961).

Almost surely, 2^255218639894 is an apocalyptic number.

255218639894 is a deficient number, since it is larger than the sum of its proper divisors (127609319950).

255218639894 is a wasteful number, since it uses less digits than its factorization.

255218639894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127609319949.

The product of its digits is 37324800, while the sum is 62.

The spelling of 255218639894 in words is "two hundred fifty-five billion, two hundred eighteen million, six hundred thirty-nine thousand, eight hundred ninety-four".