18880645567 has 8 divisors (see below), whose sum is σ = 21768836256. Its totient is φ = 16040193792.

The previous prime is 18880645549. The next prime is 18880645571. The reversal of 18880645567 is 76554608881.

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

It is not a de Polignac number, because 18880645567 - 2¹⁵ = 18880612799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18880645507) 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, 11933878 + ... + 11935459.

It is an arithmetic number, because the mean of its divisors is an integer number (2721104532).

Almost surely, 2^18880645567 is an apocalyptic number.

18880645567 is a deficient number, since it is larger than the sum of its proper divisors (2888190689).

18880645567 is a wasteful number, since it uses less digits than its factorization.

18880645567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23869457.

The product of its (nonzero) digits is 12902400, while the sum is 58.

The spelling of 18880645567 in words is "eighteen billion, eight hundred eighty million, six hundred forty-five thousand, five hundred sixty-seven".