623707820017 has 2 divisors, whose sum is σ = 623707820018. Its totient is φ = 623707820016.

The previous prime is 623707819921. The next prime is 623707820027. The reversal of 623707820017 is 710028707326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561718771441 + 61989048576 = 749479^2 + 248976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623707820017 is a prime.

It is a super-2 number, since 2×623707820017² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (623707820027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311853910008 + 311853910009.

It is an arithmetic number, because the mean of its divisors is an integer number (311853910009).

Almost surely, 2^623707820017 is an apocalyptic number.

It is an amenable number.

623707820017 is a deficient number, since it is larger than the sum of its proper divisors (1).

623707820017 is an equidigital number, since it uses as much as digits as its factorization.

623707820017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 197568, while the sum is 43.

The spelling of 623707820017 in words is "six hundred twenty-three billion, seven hundred seven million, eight hundred twenty thousand, seventeen".