663156941 has 2 divisors, whose sum is σ = 663156942. Its totient is φ = 663156940.

The previous prime is 663156931. The next prime is 663156947. The reversal of 663156941 is 149651366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 574608841 + 88548100 = 23971^2 + 9410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663156941 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 (663156947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331578470 + 331578471.

It is an arithmetic number, because the mean of its divisors is an integer number (331578471).

Almost surely, 2^663156941 is an apocalyptic number.

It is an amenable number.

663156941 is a deficient number, since it is larger than the sum of its proper divisors (1).

663156941 is an equidigital number, since it uses as much as digits as its factorization.

663156941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The square root of 663156941 is about 25751.8337405320. The cubic root of 663156941 is about 872.0447527217.

The spelling of 663156941 in words is "six hundred sixty-three million, one hundred fifty-six thousand, nine hundred forty-one".