999795568381 has 2 divisors, whose sum is σ = 999795568382. Its totient is φ = 999795568380.

The previous prime is 999795568361. The next prime is 999795568399. The reversal of 999795568381 is 183865597999.

999795568381 = 707034² + 707035².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499898491225 + 499897077156 = 707035^2 + 707034^2 .

It is a cyclic number.

It is not a de Polignac number, because 999795568381 - 2⁷ = 999795568253 is a prime.

It is a super-2 number, since 2×999795568381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999795568301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499897784190 + 499897784191.

It is an arithmetic number, because the mean of its divisors is an integer number (499897784191).

Almost surely, 2^999795568381 is an apocalyptic number.

999795568381 is the 707035-th centered square number.

It is an amenable number.

999795568381 is a deficient number, since it is larger than the sum of its proper divisors (1).

999795568381 is an equidigital number, since it uses as much as digits as its factorization.

999795568381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1322697600, while the sum is 79.

The spelling of 999795568381 in words is "nine hundred ninety-nine billion, seven hundred ninety-five million, five hundred sixty-eight thousand, three hundred eighty-one".