861803540999 has 2 divisors, whose sum is σ = 861803541000. Its totient is φ = 861803540998.

The previous prime is 861803540989. The next prime is 861803541029. The reversal of 861803540999 is 999045308168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861803540999 - 2⁸ = 861803540743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861803540989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430901770499 + 430901770500.

It is an arithmetic number, because the mean of its divisors is an integer number (430901770500).

Almost surely, 2^861803540999 is an apocalyptic number.

861803540999 is a deficient number, since it is larger than the sum of its proper divisors (1).

861803540999 is an equidigital number, since it uses as much as digits as its factorization.

861803540999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16796160, while the sum is 62.

The spelling of 861803540999 in words is "eight hundred sixty-one billion, eight hundred three million, five hundred forty thousand, nine hundred ninety-nine".