646623059 has 2 divisors, whose sum is σ = 646623060. Its totient is φ = 646623058.

The previous prime is 646623023. The next prime is 646623071. The reversal of 646623059 is 950326646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646623059 is a prime.

It is equal to p_33626993 and since 646623059 and 33626993 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (646623559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323311529 + 323311530.

It is an arithmetic number, because the mean of its divisors is an integer number (323311530).

Almost surely, 2^646623059 is an apocalyptic number.

646623059 is a deficient number, since it is larger than the sum of its proper divisors (1).

646623059 is an equidigital number, since it uses as much as digits as its factorization.

646623059 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 41.

The square root of 646623059 is about 25428.7840645203. The cubic root of 646623059 is about 864.7363777270.

The spelling of 646623059 in words is "six hundred forty-six million, six hundred twenty-three thousand, fifty-nine".