999806900259361 has 2 divisors, whose sum is σ = 999806900259362. Its totient is φ = 999806900259360.

The previous prime is 999806900259319. The next prime is 999806900259383. The reversal of 999806900259361 is 163952009608999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 828313208545761 + 171493691713600 = 28780431^2 + 13095560^2 .

It is a cyclic number.

It is not a de Polignac number, because 999806900259361 - 2⁹ = 999806900258849 is a prime.

It is a super-2 number, since 2×999806900259361² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999806900259961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499903450129680 + 499903450129681.

It is an arithmetic number, because the mean of its divisors is an integer number (499903450129681).

Almost surely, 2^{999806900259361} is an apocalyptic number.

It is an amenable number.

999806900259361 is a deficient number, since it is larger than the sum of its proper divisors (1).

999806900259361 is an equidigital number, since it uses as much as digits as its factorization.

999806900259361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 510183360, while the sum is 76.

The spelling of 999806900259361 in words is "nine hundred ninety-nine trillion, eight hundred six billion, nine hundred million, two hundred fifty-nine thousand, three hundred sixty-one".