623666353 has 2 divisors, whose sum is σ = 623666354. Its totient is φ = 623666352.

The previous prime is 623666311. The next prime is 623666377. The reversal of 623666353 is 353666326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381303729 + 242362624 = 19527^2 + 15568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623666353 is a prime.

It is not a weakly prime, because it can be changed into another prime (623666653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311833176 + 311833177.

It is an arithmetic number, because the mean of its divisors is an integer number (311833177).

Almost surely, 2^623666353 is an apocalyptic number.

It is an amenable number.

623666353 is a deficient number, since it is larger than the sum of its proper divisors (1).

623666353 is an equidigital number, since it uses as much as digits as its factorization.

623666353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 40.

The square root of 623666353 is about 24973.3128158841. The cubic root of 623666353 is about 854.3794057942.

The spelling of 623666353 in words is "six hundred twenty-three million, six hundred sixty-six thousand, three hundred fifty-three".