251266065 has 16 divisors (see below), whose sum is σ = 404353728. Its totient is φ = 133232576.

The previous prime is 251266061. The next prime is 251266079. The reversal of 251266065 is 560662152.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 251266065 - 2² = 251266061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251266061) 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, 45819 + ... + 51008.

It is an arithmetic number, because the mean of its divisors is an integer number (25272108).

Almost surely, 2^251266065 is an apocalyptic number.

It is an amenable number.

251266065 is a deficient number, since it is larger than the sum of its proper divisors (153087663).

251266065 is a wasteful number, since it uses less digits than its factorization.

251266065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97008.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 251266065 is about 15851.3742306464. The cubic root of 251266065 is about 631.0221627852.

The spelling of 251266065 in words is "two hundred fifty-one million, two hundred sixty-six thousand, sixty-five".