201668699 has 4 divisors (see below), whose sum is σ = 202876464. Its totient is φ = 200460936.

The previous prime is 201668693. The next prime is 201668707. The reversal of 201668699 is 996866102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 996866102 = 2 ⋅498433051.

It is a cyclic number.

It is not a de Polignac number, because 201668699 - 2⁸ = 201668443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201668693) 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, 603632 + ... + 603965.

It is an arithmetic number, because the mean of its divisors is an integer number (50719116).

Almost surely, 2^201668699 is an apocalyptic number.

201668699 is a deficient number, since it is larger than the sum of its proper divisors (1207765).

201668699 is a wasteful number, since it uses less digits than its factorization.

201668699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207764.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 201668699 is about 14201.0104922150. The cubic root of 201668699 is about 586.4254802678.

The spelling of 201668699 in words is "two hundred one million, six hundred sixty-eight thousand, six hundred ninety-nine".