201666657 has 8 divisors (see below), whose sum is σ = 270602176. Its totient is φ = 133587792.

The previous prime is 201666653. The next prime is 201666683. The reversal of 201666657 is 756666102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201666657 - 2² = 201666653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201666653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213613 + ... + 214554.

It is an arithmetic number, because the mean of its divisors is an integer number (33825272).

Almost surely, 2^201666657 is an apocalyptic number.

It is an amenable number.

201666657 is a deficient number, since it is larger than the sum of its proper divisors (68935519).

201666657 is a wasteful number, since it uses less digits than its factorization.

201666657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428327.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 201666657 is about 14200.9385957408. The cubic root of 201666657 is about 586.4235009739.

The spelling of 201666657 in words is "two hundred one million, six hundred sixty-six thousand, six hundred fifty-seven".