18711745890 has 16 divisors (see below), whose sum is σ = 44908190208. Its totient is φ = 4989798896.

The previous prime is 18711745879. The next prime is 18711745901. The reversal of 18711745890 is 9854711781.

It is an interprime number because it is at equal distance from previous prime (18711745879) and next prime (18711745901).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 311862402 + ... + 311862461.

It is an arithmetic number, because the mean of its divisors is an integer number (2806761888).

Almost surely, 2^18711745890 is an apocalyptic number.

18711745890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18711745890 is an abundant number, since it is smaller than the sum of its proper divisors (26196444318).

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

18711745890 is a wasteful number, since it uses less digits than its factorization.

18711745890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623724873.

The product of its (nonzero) digits is 564480, while the sum is 51.

The spelling of 18711745890 in words is "eighteen billion, seven hundred eleven million, seven hundred forty-five thousand, eight hundred ninety".