646550092561 has 2 divisors, whose sum is σ = 646550092562. Its totient is φ = 646550092560.

The previous prime is 646550092553. The next prime is 646550092567. The reversal of 646550092561 is 165290055646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 532964241936 + 113585850625 = 730044^2 + 337025^2 .

It is a cyclic number.

It is not a de Polignac number, because 646550092561 - 2³ = 646550092553 is a prime.

It is not a weakly prime, because it can be changed into another prime (646550092567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323275046280 + 323275046281.

It is an arithmetic number, because the mean of its divisors is an integer number (323275046281).

Almost surely, 2^646550092561 is an apocalyptic number.

It is an amenable number.

646550092561 is a deficient number, since it is larger than the sum of its proper divisors (1).

646550092561 is an equidigital number, since it uses as much as digits as its factorization.

646550092561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944000, while the sum is 49.

The spelling of 646550092561 in words is "six hundred forty-six billion, five hundred fifty million, ninety-two thousand, five hundred sixty-one".