18993473250 has 64 divisors (see below), whose sum is σ = 47427254784. Its totient is φ = 5062838400.

The previous prime is 18993473243. The next prime is 18993473269. The reversal of 18993473250 is 5237439981.

It is a junction number, because it is equal to n+sod(n) for n = 18993473193 and 18993473202.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2871447 + ... + 2878053.

It is an arithmetic number, because the mean of its divisors is an integer number (741050856).

Almost surely, 2^18993473250 is an apocalyptic number.

18993473250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18993473250 is an abundant number, since it is smaller than the sum of its proper divisors (28433781534).

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

18993473250 is a wasteful number, since it uses less digits than its factorization.

18993473250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10460 (or 10450 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 18993473250 in words is "eighteen billion, nine hundred ninety-three million, four hundred seventy-three thousand, two hundred fifty".