18947291850 has 48 divisors (see below), whose sum is σ = 52210319040. Its totient is φ = 5052610800.

The previous prime is 18947291833. The next prime is 18947291851. The reversal of 18947291850 is 5819274981.

It is a happy number.

18947291850 is a `hidden beast` number, since 1 + 8 + 9 + 472 + 91 + 85 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (18947291851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7016166 + ... + 7018865.

It is an arithmetic number, because the mean of its divisors is an integer number (1087714980).

Almost surely, 2^18947291850 is an apocalyptic number.

18947291850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18947291850 is an abundant number, since it is smaller than the sum of its proper divisors (33263027190).

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

18947291850 is a wasteful number, since it uses less digits than its factorization.

18947291850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14035052 (or 14035041 counting only the distinct ones).

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

The spelling of 18947291850 in words is "eighteen billion, nine hundred forty-seven million, two hundred ninety-one thousand, eight hundred fifty".