81763872859 has 2 divisors, whose sum is σ = 81763872860. Its totient is φ = 81763872858.

The previous prime is 81763872847. The next prime is 81763872893. The reversal of 81763872859 is 95827836718.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81763872859 - 2¹⁹ = 81763348571 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81763872859.

It is not a weakly prime, because it can be changed into another prime (81763872559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40881936429 + 40881936430.

It is an arithmetic number, because the mean of its divisors is an integer number (40881936430).

Almost surely, 2^81763872859 is an apocalyptic number.

81763872859 is a deficient number, since it is larger than the sum of its proper divisors (1).

81763872859 is an equidigital number, since it uses as much as digits as its factorization.

81763872859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40642560, while the sum is 64.

The spelling of 81763872859 in words is "eighty-one billion, seven hundred sixty-three million, eight hundred seventy-two thousand, eight hundred fifty-nine".