18949208125 has 10 divisors (see below), whose sum is σ = 23678931254. Its totient is φ = 15159366000.

The previous prime is 18949208119. The next prime is 18949208129. The reversal of 18949208125 is 52180294981.

It can be written as a sum of positive squares in 5 ways, for example, as 2674337796 + 16274870329 = 51714^2 + 127573^2 .

It is not a de Polignac number, because 18949208125 - 2²⁹ = 18412337213 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 (18949208129) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15158742 + ... + 15159991.

Almost surely, 2^18949208125 is an apocalyptic number.

It is an amenable number.

18949208125 is a deficient number, since it is larger than the sum of its proper divisors (4729723129).

18949208125 is an frugal number, since it uses more digits than its factorization.

18949208125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30318753 (or 30318738 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 49.

The spelling of 18949208125 in words is "eighteen billion, nine hundred forty-nine million, two hundred eight thousand, one hundred twenty-five".