646662222449 has 2 divisors, whose sum is σ = 646662222450. Its totient is φ = 646662222448.

The previous prime is 646662222397. The next prime is 646662222497. The reversal of 646662222449 is 944222266646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397454593600 + 249207628849 = 630440^2 + 499207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646662222449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646662222449.

It is not a weakly prime, because it can be changed into another prime (646662252449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323331111224 + 323331111225.

It is an arithmetic number, because the mean of its divisors is an integer number (323331111225).

Almost surely, 2^646662222449 is an apocalyptic number.

It is an amenable number.

646662222449 is a deficient number, since it is larger than the sum of its proper divisors (1).

646662222449 is an equidigital number, since it uses as much as digits as its factorization.

646662222449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11943936, while the sum is 53.

The spelling of 646662222449 in words is "six hundred forty-six billion, six hundred sixty-two million, two hundred twenty-two thousand, four hundred forty-nine".