18431693950 has 24 divisors (see below), whose sum is σ = 34287908112. Its totient is φ = 7371611520.

The previous prime is 18431693939. The next prime is 18431694067. The reversal of 18431693950 is 5939613481.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18431693894 and 18431693903.

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, 385782 + ... + 430918.

It is an arithmetic number, because the mean of its divisors is an integer number (1428662838).

Almost surely, 2^18431693950 is an apocalyptic number.

18431693950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18431693950 is a deficient number, since it is larger than the sum of its proper divisors (15856214162).

18431693950 is a wasteful number, since it uses less digits than its factorization.

18431693950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53316 (or 53311 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 49.

The spelling of 18431693950 in words is "eighteen billion, four hundred thirty-one million, six hundred ninety-three thousand, nine hundred fifty".