81568867071191 has 8 divisors (see below), whose sum is σ = 84383962563600. Its totient is φ = 78753929974720.

The previous prime is 81568867071137. The next prime is 81568867071281. The reversal of 81568867071191 is 19117076886518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81568867071191 - 2²⁶ = 81568799962327 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 (81568867070191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38550806 + ... + 40611603.

It is an arithmetic number, because the mean of its divisors is an integer number (10547995320450).

Almost surely, 2^{81568867071191} is an apocalyptic number.

81568867071191 is a deficient number, since it is larger than the sum of its proper divisors (2815095492409).

81568867071191 is a wasteful number, since it uses less digits than its factorization.

81568867071191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79197969.

The product of its (nonzero) digits is 40642560, while the sum is 68.

The spelling of 81568867071191 in words is "eighty-one trillion, five hundred sixty-eight billion, eight hundred sixty-seven million, seventy-one thousand, one hundred ninety-one".