201664065 has 16 divisors (see below), whose sum is σ = 328132800. Its totient is φ = 105730752.

The previous prime is 201664039. The next prime is 201664087. The reversal of 201664065 is 560466102.

It is a de Polignac number, because none of the positive numbers 2^k-201664065 is a prime.

It is a super-2 number, since 2×201664065² = 81336790224648450, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113050 + ... + 114819.

It is an arithmetic number, because the mean of its divisors is an integer number (20508300).

Almost surely, 2^201664065 is an apocalyptic number.

It is an amenable number.

201664065 is a deficient number, since it is larger than the sum of its proper divisors (126468735).

201664065 is a wasteful number, since it uses less digits than its factorization.

201664065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227936.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 201664065 is about 14200.8473338741. The cubic root of 201664065 is about 586.4209885503.

The spelling of 201664065 in words is "two hundred one million, six hundred sixty-four thousand, sixty-five".