18955391908 has 12 divisors (see below), whose sum is σ = 33177523932. Its totient is φ = 9476099360.

The previous prime is 18955391891. The next prime is 18955391927. The reversal of 18955391908 is 80919355981.

It can be written as a sum of positive squares in 2 ways, for example, as 5726251584 + 13229140324 = 75672^2 + 115018^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372235 + ... + 420082.

It is an arithmetic number, because the mean of its divisors is an integer number (2764793661).

Almost surely, 2^18955391908 is an apocalyptic number.

It is an amenable number.

18955391908 is a deficient number, since it is larger than the sum of its proper divisors (14222132024).

18955391908 is a wasteful number, since it uses less digits than its factorization.

18955391908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798302 (or 798300 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 58.

The spelling of 18955391908 in words is "eighteen billion, nine hundred fifty-five million, three hundred ninety-one thousand, nine hundred eight".