18125784990 has 32 divisors (see below), whose sum is σ = 48335427360. Its totient is φ = 4833542592.

The previous prime is 18125784949. The next prime is 18125785021. The reversal of 18125784990 is 9948752181.

It is a happy number.

18125784990 is a `hidden beast` number, since 1 + 81 + 2 + 5 + 78 + 499 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33565999 + ... + 33566538.

It is an arithmetic number, because the mean of its divisors is an integer number (1510482105).

Almost surely, 2^18125784990 is an apocalyptic number.

18125784990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18125784990 is an abundant number, since it is smaller than the sum of its proper divisors (30209642370).

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

18125784990 is a wasteful number, since it uses less digits than its factorization.

18125784990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67132553 (or 67132547 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 18125784990 in words is "eighteen billion, one hundred twenty-five million, seven hundred eighty-four thousand, nine hundred ninety".