81154675174823 has 8 divisors (see below), whose sum is σ = 82500749280768. Its totient is φ = 79817370281784.

The previous prime is 81154675174787. The next prime is 81154675174861. The reversal of 81154675174823 is 32847157645118.

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 81154675174823 - 2²⁰ = 81154674126247 is a prime.

It is a super-2 number, since 2×81154675174823² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81154675174883) 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, 2192284565 + ... + 2192321582.

It is an arithmetic number, because the mean of its divisors is an integer number (10312593660096).

Almost surely, 2^{81154675174823} is an apocalyptic number.

81154675174823 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

81154675174823 is a deficient number, since it is larger than the sum of its proper divisors (1346074105945).

81154675174823 is a wasteful number, since it uses less digits than its factorization.

81154675174823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384606453.

The product of its digits is 45158400, while the sum is 62.

The spelling of 81154675174823 in words is "eighty-one trillion, one hundred fifty-four billion, six hundred seventy-five million, one hundred seventy-four thousand, eight hundred twenty-three".