18616876657 has 4 divisors (see below), whose sum is σ = 18684085876. Its totient is φ = 18549667440.

The previous prime is 18616876651. The next prime is 18616876661. The reversal of 18616876657 is 75667861681.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7701642081 + 10915234576 = 87759^2 + 104476^2 .

It is a cyclic number.

It is not a de Polignac number, because 18616876657 - 2¹⁹ = 18616352369 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18616876595 and 18616876604.

It is not an unprimeable number, because it can be changed into a prime (18616876651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33604194 + ... + 33604747.

It is an arithmetic number, because the mean of its divisors is an integer number (4671021469).

Almost surely, 2^18616876657 is an apocalyptic number.

It is an amenable number.

18616876657 is a deficient number, since it is larger than the sum of its proper divisors (67209219).

18616876657 is an equidigital number, since it uses as much as digits as its factorization.

18616876657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67209218.

The product of its digits is 20321280, while the sum is 61.

The spelling of 18616876657 in words is "eighteen billion, six hundred sixteen million, eight hundred seventy-six thousand, six hundred fifty-seven".