18851907650 has 12 divisors (see below), whose sum is σ = 35064548322. Its totient is φ = 7540763040.

The previous prime is 18851907637. The next prime is 18851907661. The reversal of 18851907650 is 5670915881.

It can be written as a sum of positive squares in 3 ways, for example, as 14120806561 + 4731101089 = 118831^2 + 68783^2 .

It is a Harshad number since it is a multiple of its sum of digits (50), and also a Moran number because the ratio is a prime number: 377038153 = 18851907650 / (1 + 8 + 8 + 5 + 1 + 9 + 0 + 7 + 6 + 5 + 0).

It is a Curzon number.

It is an unprimeable number.

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, 188519027 + ... + 188519126.

Almost surely, 2^18851907650 is an apocalyptic number.

18851907650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18851907650 is a deficient number, since it is larger than the sum of its proper divisors (16212640672).

18851907650 is a wasteful number, since it uses less digits than its factorization.

18851907650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377038165 (or 377038160 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 50.

The spelling of 18851907650 in words is "eighteen billion, eight hundred fifty-one million, nine hundred seven thousand, six hundred fifty".