81079326863 has 4 divisors (see below), whose sum is σ = 82964892648. Its totient is φ = 79193761080.

The previous prime is 81079326851. The next prime is 81079326899. The reversal of 81079326863 is 36862397018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81079326863 - 2⁸ = 81079326607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81079326833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 942782828 + ... + 942782913.

It is an arithmetic number, because the mean of its divisors is an integer number (20741223162).

Almost surely, 2^81079326863 is an apocalyptic number.

81079326863 is a deficient number, since it is larger than the sum of its proper divisors (1885565785).

81079326863 is a wasteful number, since it uses less digits than its factorization.

81079326863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885565784.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 81079326863 in words is "eighty-one billion, seventy-nine million, three hundred twenty-six thousand, eight hundred sixty-three".