18645786840 has 64 divisors (see below), whose sum is σ = 56017409760. Its totient is φ = 4965094400.

The previous prime is 18645786839. The next prime is 18645786869. The reversal of 18645786840 is 4868754681.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 26709 + ... + 194948.

Almost surely, 2^18645786840 is an apocalyptic number.

18645786840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18645786840 is an abundant number, since it is smaller than the sum of its proper divisors (37371622920).

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

18645786840 is a wasteful number, since it uses less digits than its factorization.

18645786840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222372 (or 222368 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 57.

The spelling of 18645786840 in words is "eighteen billion, six hundred forty-five million, seven hundred eighty-six thousand, eight hundred forty".