660751 has 16 divisors (see below), whose sum is σ = 834624. Its totient is φ = 509184.

The previous prime is 660733. The next prime is 660757. The reversal of 660751 is 157066.

It is not a de Polignac number, because 660751 - 2⁵ = 660719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660757) 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, 4755 + ... + 4891.

It is an arithmetic number, because the mean of its divisors is an integer number (52164).

2⁶⁶⁰⁷⁵¹ is an apocalyptic number.

660751 is a deficient number, since it is larger than the sum of its proper divisors (173873).

660751 is a wasteful number, since it uses less digits than its factorization.

660751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 660751 is about 812.8659176027. The cubic root of 660751 is about 87.0988878656.

The spelling of 660751 in words is "six hundred sixty thousand, seven hundred fifty-one".