251216266 has 32 divisors (see below), whose sum is σ = 446560128. Its totient is φ = 103752960.

The previous prime is 251216261. The next prime is 251216311. The reversal of 251216266 is 662612152.

251216266 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×251216266² = 126219224605965512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251216261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45006 + ... + 50278.

It is an arithmetic number, because the mean of its divisors is an integer number (13955004).

Almost surely, 2^251216266 is an apocalyptic number.

251216266 is a deficient number, since it is larger than the sum of its proper divisors (195343862).

251216266 is a wasteful number, since it uses less digits than its factorization.

251216266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5406.

The product of its digits is 8640, while the sum is 31.

The square root of 251216266 is about 15849.8033426286. The cubic root of 251216266 is about 630.9804721190.

The spelling of 251216266 in words is "two hundred fifty-one million, two hundred sixteen thousand, two hundred sixty-six".