18999747870 has 64 divisors (see below), whose sum is σ = 48018216960. Its totient is φ = 4798051200.

The previous prime is 18999747847. The next prime is 18999747901. The reversal of 18999747870 is 7874799981.

It is a junction number, because it is equal to n+sod(n) for n = 18999747795 and 18999747804.

It is a congruent 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 31 ways as a sum of consecutive naturals, for example, 1967955 + ... + 1977585.

It is an arithmetic number, because the mean of its divisors is an integer number (750284640).

Almost surely, 2^18999747870 is an apocalyptic number.

18999747870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18999747870 is an abundant number, since it is smaller than the sum of its proper divisors (29018469090).

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

18999747870 is a wasteful number, since it uses less digits than its factorization.

18999747870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13121.

The product of its (nonzero) digits is 64012032, while the sum is 69.

The spelling of 18999747870 in words is "eighteen billion, nine hundred ninety-nine million, seven hundred forty-seven thousand, eight hundred seventy".