623501786989 has 2 divisors, whose sum is σ = 623501786990. Its totient is φ = 623501786988.

The previous prime is 623501786953. The next prime is 623501787047. The reversal of 623501786989 is 989687105326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 397729512964 + 225772274025 = 630658^2 + 475155^2 .

It is a cyclic number.

It is not a de Polignac number, because 623501786989 - 2⁹ = 623501786477 is a prime.

It is a super-2 number, since 2×623501786989² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 623501786989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623501786689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311750893494 + 311750893495.

It is an arithmetic number, because the mean of its divisors is an integer number (311750893495).

Almost surely, 2^623501786989 is an apocalyptic number.

It is an amenable number.

623501786989 is a deficient number, since it is larger than the sum of its proper divisors (1).

623501786989 is an equidigital number, since it uses as much as digits as its factorization.

623501786989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39191040, while the sum is 64.

The spelling of 623501786989 in words is "six hundred twenty-three billion, five hundred one million, seven hundred eighty-six thousand, nine hundred eighty-nine".