660844039 has 2 divisors, whose sum is σ = 660844040. Its totient is φ = 660844038.

The previous prime is 660844031. The next prime is 660844057. The reversal of 660844039 is 930448066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660844039 - 2³ = 660844031 is a prime.

It is equal to p_34327795 and since 660844039 and 34327795 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 660843992 and 660844010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660844031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330422019 + 330422020.

It is an arithmetic number, because the mean of its divisors is an integer number (330422020).

Almost surely, 2^660844039 is an apocalyptic number.

660844039 is a deficient number, since it is larger than the sum of its proper divisors (1).

660844039 is an equidigital number, since it uses as much as digits as its factorization.

660844039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 660844039 is about 25706.8869955115. The cubic root of 660844039 is about 871.0297574593.

The spelling of 660844039 in words is "six hundred sixty million, eight hundred forty-four thousand, thirty-nine".