660465917 has 2 divisors, whose sum is σ = 660465918. Its totient is φ = 660465916.

The previous prime is 660465901. The next prime is 660465931. The reversal of 660465917 is 719564066.

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., 398641156 + 261824761 = 19966^2 + 16181^2 .

It is a cyclic number.

It is not a de Polignac number, because 660465917 - 2⁴ = 660465901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660465977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330232958 + 330232959.

It is an arithmetic number, because the mean of its divisors is an integer number (330232959).

Almost surely, 2^660465917 is an apocalyptic number.

It is an amenable number.

660465917 is a deficient number, since it is larger than the sum of its proper divisors (1).

660465917 is an equidigital number, since it uses as much as digits as its factorization.

660465917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 660465917 is about 25699.5314548729. The cubic root of 660465917 is about 870.8635970486.

The spelling of 660465917 in words is "six hundred sixty million, four hundred sixty-five thousand, nine hundred seventeen".