81181248167 has 4 divisors (see below), whose sum is σ = 81181850160. Its totient is φ = 81180646176.

The previous prime is 81181248101. The next prime is 81181248179. The reversal of 81181248167 is 76184218118.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 81181248167 - 2²⁴ = 81164470951 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 (81181248067) 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, 4934 + ... + 402972.

It is an arithmetic number, because the mean of its divisors is an integer number (20295462540).

Almost surely, 2^81181248167 is an apocalyptic number.

81181248167 is a deficient number, since it is larger than the sum of its proper divisors (601993).

81181248167 is a wasteful number, since it uses less digits than its factorization.

81181248167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601992.

The product of its digits is 172032, while the sum is 47.

The spelling of 81181248167 in words is "eighty-one billion, one hundred eighty-one million, two hundred forty-eight thousand, one hundred sixty-seven".