662681 has 2 divisors, whose sum is σ = 662682. Its totient is φ = 662680.

The previous prime is 662671. The next prime is 662689. The reversal of 662681 is 186266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 502681 + 160000 = 709^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 662681 - 2⁶ = 662617 is a prime.

It is a super-2 number, since 2×662681² = 878292215522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (662689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331340 + 331341.

It is an arithmetic number, because the mean of its divisors is an integer number (331341).

2⁶⁶²⁶⁸¹ is an apocalyptic number.

It is an amenable number.

662681 is a deficient number, since it is larger than the sum of its proper divisors (1).

662681 is an equidigital number, since it uses as much as digits as its factorization.

662681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 662681 is about 814.0522096279. The cubic root of 662681 is about 87.1836083574.

The spelling of 662681 in words is "six hundred sixty-two thousand, six hundred eighty-one".