855663839518 has 32 divisors (see below), whose sum is σ = 1372522636800. Its totient is φ = 398904906816.

The previous prime is 855663839501. The next prime is 855663839539. The reversal of 855663839518 is 815938366558.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 484305 + ... + 1394947.

It is an arithmetic number, because the mean of its divisors is an integer number (42891332400).

Almost surely, 2^855663839518 is an apocalyptic number.

855663839518 is a deficient number, since it is larger than the sum of its proper divisors (516858797282).

855663839518 is a wasteful number, since it uses less digits than its factorization.

855663839518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911056.

The product of its digits is 186624000, while the sum is 67.

The spelling of 855663839518 in words is "eight hundred fifty-five billion, six hundred sixty-three million, eight hundred thirty-nine thousand, five hundred eighteen".