251625066 has 96 divisors (see below), whose sum is σ = 642485760. Its totient is φ = 64294560.

The previous prime is 251625019. The next prime is 251625089. The reversal of 251625066 is 660526152.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 340125 + ... + 340863.

It is an arithmetic number, because the mean of its divisors is an integer number (6692560).

Almost surely, 2^251625066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251625066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321242880).

251625066 is an abundant number, since it is smaller than the sum of its proper divisors (390860694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251625066 is a wasteful number, since it uses less digits than its factorization.

251625066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 829 counting only the distinct ones).

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

The square root of 251625066 is about 15862.6941595682. The cubic root of 251625066 is about 631.3225479342.

The spelling of 251625066 in words is "two hundred fifty-one million, six hundred twenty-five thousand, sixty-six".