201668513 has 4 divisors (see below), whose sum is σ = 201746688. Its totient is φ = 201590340.

The previous prime is 201668497. The next prime is 201668539. The reversal of 201668513 is 315866102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201668513 - 2⁴ = 201668497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 201668513.

It is not an unprimeable number, because it can be changed into a prime (201668563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35081 + ... + 40422.

It is an arithmetic number, because the mean of its divisors is an integer number (50436672).

Almost surely, 2^201668513 is an apocalyptic number.

It is an amenable number.

201668513 is a deficient number, since it is larger than the sum of its proper divisors (78175).

201668513 is an equidigital number, since it uses as much as digits as its factorization.

201668513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78174.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 201668513 is about 14201.0039433837. The cubic root of 201668513 is about 586.4252999801.

The spelling of 201668513 in words is "two hundred one million, six hundred sixty-eight thousand, five hundred thirteen".