201664161 has 20 divisors (see below), whose sum is σ = 314352192. Its totient is φ = 128596248.

The previous prime is 201664159. The next prime is 201664163. The reversal of 201664161 is 161466102.

201664161 is a `hidden beast` number, since 2 + 0 + 16 + 641 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (201664159) and next prime (201664163).

It is not a de Polignac number, because 201664161 - 2¹ = 201664159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (201664163) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 52261 + ... + 55986.

Almost surely, 2^201664161 is an apocalyptic number.

It is an amenable number.

201664161 is a deficient number, since it is larger than the sum of its proper divisors (112688031).

201664161 is a wasteful number, since it uses less digits than its factorization.

201664161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108282 (or 108273 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 201664161 is about 14200.8507139537. The cubic root of 201664161 is about 586.4210816034.

The spelling of 201664161 in words is "two hundred one million, six hundred sixty-four thousand, one hundred sixty-one".