18139453950 has 24 divisors (see below), whose sum is σ = 44985846168. Its totient is φ = 4837187680.

The previous prime is 18139453903. The next prime is 18139454017. The reversal of 18139453950 is 5935493181.

It is a super-3 number, since 3×18139453950³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18139453950.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60464697 + ... + 60464996.

It is an arithmetic number, because the mean of its divisors is an integer number (1874410257).

Almost surely, 2^18139453950 is an apocalyptic number.

18139453950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18139453950 is an abundant number, since it is smaller than the sum of its proper divisors (26846392218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18139453950 is a wasteful number, since it uses less digits than its factorization.

18139453950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120929708 (or 120929703 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 48.

The spelling of 18139453950 in words is "eighteen billion, one hundred thirty-nine million, four hundred fifty-three thousand, nine hundred fifty".