81056682331 has 8 divisors (see below), whose sum is σ = 82666677744. Its totient is φ = 79455757920.

The previous prime is 81056682277. The next prime is 81056682341. The reversal of 81056682331 is 13328665018.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81056682331 is a prime.

It is a super-2 number, since 2×81056682331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81056682341) 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, 2249701 + ... + 2285446.

It is an arithmetic number, because the mean of its divisors is an integer number (10333334718).

Almost surely, 2^81056682331 is an apocalyptic number.

81056682331 is a deficient number, since it is larger than the sum of its proper divisors (1609995413).

81056682331 is a wasteful number, since it uses less digits than its factorization.

81056682331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535501.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 81056682331 in words is "eighty-one billion, fifty-six million, six hundred eighty-two thousand, three hundred thirty-one".