660878833 has 2 divisors, whose sum is σ = 660878834. Its totient is φ = 660878832.

The previous prime is 660878753. The next prime is 660878839. The reversal of 660878833 is 338878066.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617621904 + 43256929 = 24852^2 + 6577^2 .

It is a cyclic number.

It is not a de Polignac number, because 660878833 - 2⁹ = 660878321 is a prime.

It is not a weakly prime, because it can be changed into another prime (660878839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330439416 + 330439417.

It is an arithmetic number, because the mean of its divisors is an integer number (330439417).

Almost surely, 2^660878833 is an apocalyptic number.

It is an amenable number.

660878833 is a deficient number, since it is larger than the sum of its proper divisors (1).

660878833 is an equidigital number, since it uses as much as digits as its factorization.

660878833 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The square root of 660878833 is about 25707.5637313223. The cubic root of 660878833 is about 871.0450440099.

The spelling of 660878833 in words is "six hundred sixty million, eight hundred seventy-eight thousand, eight hundred thirty-three".