201664603668 has 24 divisors (see below), whose sum is σ = 513328082400. Its totient is φ = 61110485920.

The previous prime is 201664603643. The next prime is 201664603697. The reversal of 201664603668 is 866306466102.

It is a super-2 number, since 2×201664603668² (a number of 23 digits) contains 22 as substring.

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, 763880943 + ... + 763881206.

It is an arithmetic number, because the mean of its divisors is an integer number (21388670100).

Almost surely, 2^201664603668 is an apocalyptic number.

It is an amenable number.

201664603668 is an abundant number, since it is smaller than the sum of its proper divisors (311663478732).

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

201664603668 is a wasteful number, since it uses less digits than its factorization.

201664603668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527762167 (or 1527762165 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 48.

The spelling of 201664603668 in words is "two hundred one billion, six hundred sixty-four million, six hundred three thousand, six hundred sixty-eight".