18885920787 has 6 divisors (see below), whose sum is σ = 27279663372. Its totient is φ = 12590613852.

The previous prime is 18885920783. The next prime is 18885920813. The reversal of 18885920787 is 78702958881.

It is not a de Polignac number, because 18885920787 - 2² = 18885920783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18885920783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1049217813 + ... + 1049217830.

It is an arithmetic number, because the mean of its divisors is an integer number (4546610562).

Almost surely, 2^18885920787 is an apocalyptic number.

18885920787 is a deficient number, since it is larger than the sum of its proper divisors (8393742585).

18885920787 is a wasteful number, since it uses less digits than its factorization.

18885920787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2098435649 (or 2098435646 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 63.

The spelling of 18885920787 in words is "eighteen billion, eight hundred eighty-five million, nine hundred twenty thousand, seven hundred eighty-seven".