18766199945 has 8 divisors (see below), whose sum is σ = 22548058944. Its totient is φ = 14993880624.

The previous prime is 18766199911. The next prime is 18766199953. The reversal of 18766199945 is 54999166781.

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 18766199945 - 2²⁸ = 18497764489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2380589 + ... + 2388458.

It is an arithmetic number, because the mean of its divisors is an integer number (2818507368).

Almost surely, 2^18766199945 is an apocalyptic number.

It is an amenable number.

18766199945 is a deficient number, since it is larger than the sum of its proper divisors (3781858999).

18766199945 is an equidigital number, since it uses as much as digits as its factorization.

18766199945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4769839.

The product of its digits is 29393280, while the sum is 65.

The spelling of 18766199945 in words is "eighteen billion, seven hundred sixty-six million, one hundred ninety-nine thousand, nine hundred forty-five".