18616916845 has 8 divisors (see below), whose sum is σ = 22376511864. Its totient is φ = 14869392384.

The previous prime is 18616916831. The next prime is 18616916867. The reversal of 18616916845 is 54861961681.

It can be written as a sum of positive squares in 4 ways, for example, as 1570219876 + 17046696969 = 39626^2 + 130563^2 .

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 18616916845 - 2¹⁷ = 18616785773 is a prime.

It is a Duffinian number.

It is a congruent 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, 3014244 + ... + 3020413.

It is an arithmetic number, because the mean of its divisors is an integer number (2797063983).

Almost surely, 2^18616916845 is an apocalyptic number.

It is an amenable number.

18616916845 is a deficient number, since it is larger than the sum of its proper divisors (3759595019).

18616916845 is an equidigital number, since it uses as much as digits as its factorization.

18616916845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6035279.

The product of its digits is 2488320, while the sum is 55.

The spelling of 18616916845 in words is "eighteen billion, six hundred sixteen million, nine hundred sixteen thousand, eight hundred forty-five".