18945659646 has 64 divisors (see below), whose sum is σ = 42398899200. Its totient is φ = 6270715008.

The previous prime is 18945659611. The next prime is 18945659647. The reversal of 18945659646 is 64695654981.

18945659646 is a `hidden beast` number, since 1 + 8 + 9 + 4 + 565 + 9 + 64 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18945659647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10660710 + ... + 10662486.

It is an arithmetic number, because the mean of its divisors is an integer number (662482800).

Almost surely, 2^18945659646 is an apocalyptic number.

18945659646 is an abundant number, since it is smaller than the sum of its proper divisors (23453239554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18945659646 is a wasteful number, since it uses less digits than its factorization.

18945659646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3070 (or 3064 counting only the distinct ones).

The product of its digits is 55987200, while the sum is 63.

The spelling of 18945659646 in words is "eighteen billion, nine hundred forty-five million, six hundred fifty-nine thousand, six hundred forty-six".