646244561129 has 2 divisors, whose sum is σ = 646244561130. Its totient is φ = 646244561128.

The previous prime is 646244561071. The next prime is 646244561153. The reversal of 646244561129 is 921165442646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643147861225 + 3096699904 = 801965^2 + 55648^2 .

It is a cyclic number.

It is not a de Polignac number, because 646244561129 - 2²⁰ = 646243512553 is a prime.

It is not a weakly prime, because it can be changed into another prime (646244569129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323122280564 + 323122280565.

It is an arithmetic number, because the mean of its divisors is an integer number (323122280565).

Almost surely, 2^646244561129 is an apocalyptic number.

It is an amenable number.

646244561129 is a deficient number, since it is larger than the sum of its proper divisors (1).

646244561129 is an equidigital number, since it uses as much as digits as its factorization.

646244561129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 50.

The spelling of 646244561129 in words is "six hundred forty-six billion, two hundred forty-four million, five hundred sixty-one thousand, one hundred twenty-nine".