660959863 has 2 divisors, whose sum is σ = 660959864. Its totient is φ = 660959862.

The previous prime is 660959861. The next prime is 660959867. The reversal of 660959863 is 368959066.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660959863 - 2¹ = 660959861 is a prime.

Together with 660959861, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 660959863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660959861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330479931 + 330479932.

It is an arithmetic number, because the mean of its divisors is an integer number (330479932).

Almost surely, 2^660959863 is an apocalyptic number.

660959863 is a deficient number, since it is larger than the sum of its proper divisors (1).

660959863 is an equidigital number, since it uses as much as digits as its factorization.

660959863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 52.

The square root of 660959863 is about 25709.1396783323. The cubic root of 660959863 is about 871.0806420106.

The spelling of 660959863 in words is "six hundred sixty million, nine hundred fifty-nine thousand, eight hundred sixty-three".