201664771 has 12 divisors (see below), whose sum is σ = 253332016. Its totient is φ = 157140720.

The previous prime is 201664751. The next prime is 201664787. The reversal of 201664771 is 177466102.

It is a happy number.

It is not a de Polignac number, because 201664771 - 2⁵ = 201664739 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (201664721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118200 + ... + 119893.

Almost surely, 2^201664771 is an apocalyptic number.

201664771 is a deficient number, since it is larger than the sum of its proper divisors (51667245).

201664771 is a wasteful number, since it uses less digits than its factorization.

201664771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238122 (or 238111 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 201664771 is about 14200.8721915240. The cubic root of 201664771 is about 586.4216728777.

The spelling of 201664771 in words is "two hundred one million, six hundred sixty-four thousand, seven hundred seventy-one".