81154275223 has 4 divisors (see below), whose sum is σ = 92747743120. Its totient is φ = 69560807328.

The previous prime is 81154275197. The next prime is 81154275233. The reversal of 81154275223 is 32257245118.

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 81154275223 - 2²¹ = 81152178071 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 (81154275233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5796733938 + ... + 5796733951.

It is an arithmetic number, because the mean of its divisors is an integer number (23186935780).

Almost surely, 2^81154275223 is an apocalyptic number.

81154275223 is a deficient number, since it is larger than the sum of its proper divisors (11593467897).

81154275223 is a wasteful number, since it uses less digits than its factorization.

81154275223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11593467896.

The product of its digits is 134400, while the sum is 40.

The spelling of 81154275223 in words is "eighty-one billion, one hundred fifty-four million, two hundred seventy-five thousand, two hundred twenty-three".