81150645831 has 8 divisors (see below), whose sum is σ = 108204313200. Its totient is φ = 54098704512.

The previous prime is 81150645809. The next prime is 81150645847. The reversal of 81150645831 is 13854605118.

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

It is not a de Polignac number, because 81150645831 - 2⁶ = 81150645767 is a prime.

It is a super-2 number, since 2×81150645831² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81150645881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317506 + ... + 512943.

It is an arithmetic number, because the mean of its divisors is an integer number (13525539150).

Almost surely, 2^81150645831 is an apocalyptic number.

81150645831 is a deficient number, since it is larger than the sum of its proper divisors (27053667369).

81150645831 is a wasteful number, since it uses less digits than its factorization.

81150645831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863025.

The product of its (nonzero) digits is 115200, while the sum is 42.

The spelling of 81150645831 in words is "eighty-one billion, one hundred fifty million, six hundred forty-five thousand, eight hundred thirty-one".