663585893 has 2 divisors, whose sum is σ = 663585894. Its totient is φ = 663585892.

The previous prime is 663585863. The next prime is 663585947. The reversal of 663585893 is 398585366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 479522404 + 184063489 = 21898^2 + 13567^2 .

It is a cyclic number.

It is not a de Polignac number, because 663585893 - 2⁶ = 663585829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663585863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331792946 + 331792947.

It is an arithmetic number, because the mean of its divisors is an integer number (331792947).

Almost surely, 2^663585893 is an apocalyptic number.

It is an amenable number.

663585893 is a deficient number, since it is larger than the sum of its proper divisors (1).

663585893 is an equidigital number, since it uses as much as digits as its factorization.

663585893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 53.

The square root of 663585893 is about 25760.1609661120. The cubic root of 663585893 is about 872.2327347281.

The spelling of 663585893 in words is "six hundred sixty-three million, five hundred eighty-five thousand, eight hundred ninety-three".