201680065 has 16 divisors (see below), whose sum is σ = 250880400. Its totient is φ = 155457792.

The previous prime is 201680051. The next prime is 201680069. The reversal of 201680065 is 560086102.

It can be written as a sum of positive squares in 8 ways, for example, as 85988529 + 115691536 = 9273^2 + 10756^2 .

It is a cyclic number.

It is not a de Polignac number, because 201680065 - 2⁹ = 201679553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201680069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87751 + ... + 90019.

It is an arithmetic number, because the mean of its divisors is an integer number (15680025).

Almost surely, 2^201680065 is an apocalyptic number.

It is an amenable number.

201680065 is a deficient number, since it is larger than the sum of its proper divisors (49200335).

201680065 is a wasteful number, since it uses less digits than its factorization.

201680065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 201680065 is about 14201.4106693666. The cubic root of 201680065 is about 586.4364969945.

The spelling of 201680065 in words is "two hundred one million, six hundred eighty thousand, sixty-five".