663979397 has 2 divisors, whose sum is σ = 663979398. Its totient is φ = 663979396.

The previous prime is 663979373. The next prime is 663979403. The reversal of 663979397 is 793979366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 484044001 + 179935396 = 22001^2 + 13414^2 .

It is a cyclic number.

It is not a de Polignac number, because 663979397 - 2²⁴ = 647202181 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663979307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331989698 + 331989699.

It is an arithmetic number, because the mean of its divisors is an integer number (331989699).

Almost surely, 2^663979397 is an apocalyptic number.

It is an amenable number.

663979397 is a deficient number, since it is larger than the sum of its proper divisors (1).

663979397 is an equidigital number, since it uses as much as digits as its factorization.

663979397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11573604, while the sum is 59.

The square root of 663979397 is about 25767.7976746171. The cubic root of 663979397 is about 872.4051109304.

The spelling of 663979397 in words is "six hundred sixty-three million, nine hundred seventy-nine thousand, three hundred ninety-seven".