646522599797 has 2 divisors, whose sum is σ = 646522599798. Its totient is φ = 646522599796.

The previous prime is 646522599781. The next prime is 646522599817. The reversal of 646522599797 is 797995225646.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 638067061681 + 8455538116 = 798791^2 + 91954^2 .

It is a cyclic number.

It is not a de Polignac number, because 646522599797 - 2⁴ = 646522599781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646522599797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646522593797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323261299898 + 323261299899.

It is an arithmetic number, because the mean of its divisors is an integer number (323261299899).

Almost surely, 2^646522599797 is an apocalyptic number.

It is an amenable number.

646522599797 is a deficient number, since it is larger than the sum of its proper divisors (1).

646522599797 is an equidigital number, since it uses as much as digits as its factorization.

646522599797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 514382400, while the sum is 71.

The spelling of 646522599797 in words is "six hundred forty-six billion, five hundred twenty-two million, five hundred ninety-nine thousand, seven hundred ninety-seven".