18710961885 has 72 divisors (see below), whose sum is σ = 41157226656. Its totient is φ = 7775974080.

The previous prime is 18710961847. The next prime is 18710961887. The reversal of 18710961885 is 58816901781.

It is a happy number.

18710961885 is a `hidden beast` number, since 1 + 8 + 7 + 10 + 9 + 618 + 8 + 5 = 666.

It is not a de Polignac number, because 18710961885 - 2⁸ = 18710961629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18710961887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 361459 + ... + 409968.

It is an arithmetic number, because the mean of its divisors is an integer number (571628148).

Almost surely, 2^18710961885 is an apocalyptic number.

18710961885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18710961885 is an abundant number, since it is smaller than the sum of its proper divisors (22446264771).

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

18710961885 is a wasteful number, since it uses less digits than its factorization.

18710961885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771463 (or 771453 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 54.

The spelling of 18710961885 in words is "eighteen billion, seven hundred ten million, nine hundred sixty-one thousand, eight hundred eighty-five".