663329531 has 2 divisors, whose sum is σ = 663329532. Its totient is φ = 663329530.

The previous prime is 663329483. The next prime is 663329543. The reversal of 663329531 is 135923366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663329531 is a prime.

It is a super-2 number, since 2×663329531² = 880012133393359922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (663329581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331664765 + 331664766.

It is an arithmetic number, because the mean of its divisors is an integer number (331664766).

Almost surely, 2^663329531 is an apocalyptic number.

663329531 is a deficient number, since it is larger than the sum of its proper divisors (1).

663329531 is an equidigital number, since it uses as much as digits as its factorization.

663329531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 38.

The square root of 663329531 is about 25755.1845460288. The cubic root of 663329531 is about 872.1203975350.

The spelling of 663329531 in words is "six hundred sixty-three million, three hundred twenty-nine thousand, five hundred thirty-one".