18949479610 has 36 divisors (see below), whose sum is σ = 34530236622. Its totient is φ = 7487332000.

The previous prime is 18949479587. The next prime is 18949479613. The reversal of 18949479610 is 1697494981.

It can be written as a sum of positive squares in 3 ways, for example, as 18666937129 + 282542481 = 136627^2 + 16809^2 .

It is not an unprimeable number, because it can be changed into a prime (18949479613) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 43966095 + ... + 43966525.

Almost surely, 2^18949479610 is an apocalyptic number.

18949479610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18949479610 is a deficient number, since it is larger than the sum of its proper divisors (15580757012).

18949479610 is an frugal number, since it uses more digits than its factorization.

18949479610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 58.

The spelling of 18949479610 in words is "eighteen billion, nine hundred forty-nine million, four hundred seventy-nine thousand, six hundred ten".