660510493 has 2 divisors, whose sum is σ = 660510494. Its totient is φ = 660510492.

The previous prime is 660510479. The next prime is 660510511. The reversal of 660510493 is 394015066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352613284 + 307897209 = 18778^2 + 17547^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660510493 is a prime.

It is a super-2 number, since 2×660510493² = 872548222726206098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660510413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330255246 + 330255247.

It is an arithmetic number, because the mean of its divisors is an integer number (330255247).

Almost surely, 2^660510493 is an apocalyptic number.

It is an amenable number.

660510493 is a deficient number, since it is larger than the sum of its proper divisors (1).

660510493 is an equidigital number, since it uses as much as digits as its factorization.

660510493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 660510493 is about 25700.3986934055. The cubic root of 660510493 is about 870.8831886437.

The spelling of 660510493 in words is "six hundred sixty million, five hundred ten thousand, four hundred ninety-three".