251794066 has 8 divisors (see below), whose sum is σ = 390715020. Its totient is φ = 121555728.

The previous prime is 251794063. The next prime is 251794117. The reversal of 251794066 is 660497152.

It can be written as a sum of positive squares in 2 ways, for example, as 231678841 + 20115225 = 15221^2 + 4485^2 .

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 (251794063) 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, 2170581 + ... + 2170696.

Almost surely, 2^251794066 is an apocalyptic number.

251794066 is a deficient number, since it is larger than the sum of its proper divisors (138920954).

251794066 is a wasteful number, since it uses less digits than its factorization.

251794066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4341308.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 251794066 is about 15868.0202293796. The cubic root of 251794066 is about 631.4638555748.

The spelling of 251794066 in words is "two hundred fifty-one million, seven hundred ninety-four thousand, sixty-six".