999360082561 has 2 divisors, whose sum is σ = 999360082562. Its totient is φ = 999360082560.

The previous prime is 999360082543. The next prime is 999360082573. The reversal of 999360082561 is 165280063999.

999360082561 = 706880² + 706881².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499680748161 + 499679334400 = 706881^2 + 706880^2 .

It is a cyclic number.

It is not a de Polignac number, because 999360082561 - 2²⁵ = 999326528129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999360082496 and 999360082505.

It is not a weakly prime, because it can be changed into another prime (999360080561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499680041280 + 499680041281.

It is an arithmetic number, because the mean of its divisors is an integer number (499680041281).

Almost surely, 2^999360082561 is an apocalyptic number.

999360082561 is the 706881-st centered square number.

It is an amenable number.

999360082561 is a deficient number, since it is larger than the sum of its proper divisors (1).

999360082561 is an equidigital number, since it uses as much as digits as its factorization.

999360082561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6298560, while the sum is 58.

The spelling of 999360082561 in words is "nine hundred ninety-nine billion, three hundred sixty million, eighty-two thousand, five hundred sixty-one".