663631723 has 2 divisors, whose sum is σ = 663631724. Its totient is φ = 663631722.

The previous prime is 663631693. The next prime is 663631739. The reversal of 663631723 is 327136366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663631723 - 2⁵ = 663631691 is a prime.

It is not a weakly prime, because it can be changed into another prime (663631783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331815861 + 331815862.

It is an arithmetic number, because the mean of its divisors is an integer number (331815862).

Almost surely, 2^663631723 is an apocalyptic number.

663631723 is a deficient number, since it is larger than the sum of its proper divisors (1).

663631723 is an equidigital number, since it uses as much as digits as its factorization.

663631723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 37.

The square root of 663631723 is about 25761.0505026484. The cubic root of 663631723 is about 872.2528142719.

It can be divided in two parts, 66363 and 1723, that added together give a palindrome (68086).

The spelling of 663631723 in words is "six hundred sixty-three million, six hundred thirty-one thousand, seven hundred twenty-three".