251000066 has 8 divisors (see below), whose sum is σ = 376726800. Its totient is φ = 125424468.

The previous prime is 251000063. The next prime is 251000083. The reversal of 251000066 is 660000152.

251000066 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251000063) 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, 33536 + ... + 40331.

It is an arithmetic number, because the mean of its divisors is an integer number (47090850).

Almost surely, 2^251000066 is an apocalyptic number.

251000066 is a deficient number, since it is larger than the sum of its proper divisors (125726734).

251000066 is a wasteful number, since it uses less digits than its factorization.

251000066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75568.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 251000066 is about 15842.9816006963. The cubic root of 251000066 is about 630.7994101555.

The spelling of 251000066 in words is "two hundred fifty-one million, sixty-six", and thus it is an aban number.