201256666 has 8 divisors (see below), whose sum is σ = 325106964. Its totient is φ = 92887680.

The previous prime is 201256663. The next prime is 201256673. The reversal of 201256666 is 666652102.

It can be written as a sum of positive squares in 2 ways, for example, as 200930625 + 326041 = 14175^2 + 571^2 .

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

It is not an unprimeable number, because it can be changed into a prime (201256663) 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, 3870295 + ... + 3870346.

Almost surely, 2^201256666 is an apocalyptic number.

201256666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

201256666 is a deficient number, since it is larger than the sum of its proper divisors (123850298).

201256666 is a wasteful number, since it uses less digits than its factorization.

201256666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7740656.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 201256666 is about 14186.4959027943. The cubic root of 201256666 is about 586.0258290983.

The spelling of 201256666 in words is "two hundred one million, two hundred fifty-six thousand, six hundred sixty-six".