646952524861 has 2 divisors, whose sum is σ = 646952524862. Its totient is φ = 646952524860.

The previous prime is 646952524787. The next prime is 646952524931. The reversal of 646952524861 is 168425259646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 565607780761 + 81344744100 = 752069^2 + 285210^2 .

It is a cyclic number.

It is not a de Polignac number, because 646952524861 - 2⁷ = 646952524733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646952524796 and 646952524805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646952522861) 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, 323476262430 + 323476262431.

It is an arithmetic number, because the mean of its divisors is an integer number (323476262431).

Almost surely, 2^646952524861 is an apocalyptic number.

It is an amenable number.

646952524861 is a deficient number, since it is larger than the sum of its proper divisors (1).

646952524861 is an equidigital number, since it uses as much as digits as its factorization.

646952524861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24883200, while the sum is 58.

The spelling of 646952524861 in words is "six hundred forty-six billion, nine hundred fifty-two million, five hundred twenty-four thousand, eight hundred sixty-one".