668251 has 4 divisors (see below), whose sum is σ = 670104. Its totient is φ = 666400.

The previous prime is 668243. The next prime is 668273. The reversal of 668251 is 152866.

668251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668251 - 2³ = 668243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668201) 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, 190 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (167526).

2⁶⁶⁸²⁵¹ is an apocalyptic number.

668251 is a deficient number, since it is larger than the sum of its proper divisors (1853).

668251 is a wasteful number, since it uses less digits than its factorization.

668251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852.

The product of its digits is 2880, while the sum is 28.

The square root of 668251 is about 817.4662072526. The cubic root of 668251 is about 87.4271938588.

It can be divided in two parts, 668 and 251, that added together give a palindrome (919).

The spelling of 668251 in words is "six hundred sixty-eight thousand, two hundred fifty-one".