18887980643 has 8 divisors (see below), whose sum is σ = 21587106912. Its totient is φ = 16189065216.

The previous prime is 18887980621. The next prime is 18887980703. The reversal of 18887980643 is 34608978881.

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

It is a cyclic number.

It is not a de Polignac number, because 18887980643 - 2⁸ = 18887980387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18887980603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275621 + ... + 337257.

It is an arithmetic number, because the mean of its divisors is an integer number (2698388364).

Almost surely, 2^18887980643 is an apocalyptic number.

18887980643 is a deficient number, since it is larger than the sum of its proper divisors (2699126269).

18887980643 is an equidigital number, since it uses as much as digits as its factorization.

18887980643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105421.

The product of its (nonzero) digits is 18579456, while the sum is 62.

The spelling of 18887980643 in words is "eighteen billion, eight hundred eighty-seven million, nine hundred eighty thousand, six hundred forty-three".