18787822906 has 8 divisors (see below), whose sum is σ = 28187086644. Its totient is φ = 9392127360.

The previous prime is 18787822883. The next prime is 18787822919. The reversal of 18787822906 is 60922878781.

It can be written as a sum of positive squares in 2 ways, for example, as 18353475625 + 434347281 = 135475^2 + 20841^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 878845 + ... + 899968.

Almost surely, 2^18787822906 is an apocalyptic number.

18787822906 is a deficient number, since it is larger than the sum of its proper divisors (9399263738).

18787822906 is a wasteful number, since it uses less digits than its factorization.

18787822906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784096.

The product of its (nonzero) digits is 5419008, while the sum is 58.

The spelling of 18787822906 in words is "eighteen billion, seven hundred eighty-seven million, eight hundred twenty-two thousand, nine hundred six".