81278079160863 has 16 divisors (see below), whose sum is σ = 117597878487936. Its totient is φ = 49635468186720.

The previous prime is 81278079160787. The next prime is 81278079160979. The reversal of 81278079160863 is 36806197087218.

It is not a de Polignac number, because 81278079160863 - 2¹² = 81278079156767 is a prime.

It is a super-2 number, since 2×81278079160863² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81278079160794 and 81278079160803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81278079160063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7954396845 + ... + 7954407062.

It is an arithmetic number, because the mean of its divisors is an integer number (7349867405496).

Almost surely, 2^{81278079160863} is an apocalyptic number.

81278079160863 is a deficient number, since it is larger than the sum of its proper divisors (36319799327073).

81278079160863 is a wasteful number, since it uses less digits than its factorization.

81278079160863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15908804054.

The product of its (nonzero) digits is 48771072, while the sum is 66.

The spelling of 81278079160863 in words is "eighty-one trillion, two hundred seventy-eight billion, seventy-nine million, one hundred sixty thousand, eight hundred sixty-three".