18446856661 has 8 divisors (see below), whose sum is σ = 18586484000. Its totient is φ = 18307328400.

The previous prime is 18446856619. The next prime is 18446856677. The reversal of 18446856661 is 16665864481.

It is a happy number.

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 18446856661 - 2²⁹ = 17909985749 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 (18446856061) 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, 373015 + ... + 419563.

It is an arithmetic number, because the mean of its divisors is an integer number (2323310500).

Almost surely, 2^18446856661 is an apocalyptic number.

It is an amenable number.

18446856661 is a deficient number, since it is larger than the sum of its proper divisors (139627339).

18446856661 is a wasteful number, since it uses less digits than its factorization.

18446856661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49539.

The product of its digits is 6635520, while the sum is 55.

The spelling of 18446856661 in words is "eighteen billion, four hundred forty-six million, eight hundred fifty-six thousand, six hundred sixty-one".