81367292159 has 4 divisors (see below), whose sum is σ = 85649781240. Its totient is φ = 77084803080.

The previous prime is 81367292137. The next prime is 81367292183. The reversal of 81367292159 is 95129276318.

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 81367292159 - 2⁸ = 81367291903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81367292159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81367292189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2141244512 + ... + 2141244549.

It is an arithmetic number, because the mean of its divisors is an integer number (21412445310).

Almost surely, 2^81367292159 is an apocalyptic number.

81367292159 is a deficient number, since it is larger than the sum of its proper divisors (4282489081).

81367292159 is a wasteful number, since it uses less digits than its factorization.

81367292159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4282489080.

The product of its digits is 1632960, while the sum is 53.

The spelling of 81367292159 in words is "eighty-one billion, three hundred sixty-seven million, two hundred ninety-two thousand, one hundred fifty-nine".