201666687 has 32 divisors (see below), whose sum is σ = 288337920. Its totient is φ = 125141760.

The previous prime is 201666683. The next prime is 201666713. The reversal of 201666687 is 786666102.

It is a happy number.

It is not a de Polignac number, because 201666687 - 2² = 201666683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201666683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354139 + ... + 354707.

It is an arithmetic number, because the mean of its divisors is an integer number (9010560).

Almost surely, 2^201666687 is an apocalyptic number.

201666687 is a deficient number, since it is larger than the sum of its proper divisors (86671233).

201666687 is a wasteful number, since it uses less digits than its factorization.

201666687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 201666687 is about 14200.9396520089. The cubic root of 201666687 is about 586.4235300528.

The spelling of 201666687 in words is "two hundred one million, six hundred sixty-six thousand, six hundred eighty-seven".