201645663664 has 20 divisors (see below), whose sum is σ = 407674929456. Its totient is φ = 96439230272.

The previous prime is 201645663647. The next prime is 201645663671. The reversal of 201645663664 is 466366546102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273974719 + ... + 273975454.

Almost surely, 2^201645663664 is an apocalyptic number.

It is an amenable number.

201645663664 is an abundant number, since it is smaller than the sum of its proper divisors (206029265792).

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

201645663664 is a wasteful number, since it uses less digits than its factorization.

201645663664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547950204 (or 547950198 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 201645663664 in words is "two hundred one billion, six hundred forty-five million, six hundred sixty-three thousand, six hundred sixty-four".