81889982255831 has 8 divisors (see below), whose sum is σ = 84578022514800. Its totient is φ = 79244273339712.

The previous prime is 81889982255773. The next prime is 81889982255839. The reversal of 81889982255831 is 13855228998818.

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-81889982255831 is a prime.

It is a super-2 number, since 2×81889982255831² (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 (81889982255839) 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, 10582831781 + ... + 10582839518.

It is an arithmetic number, because the mean of its divisors is an integer number (10572252814350).

Almost surely, 2^{81889982255831} is an apocalyptic number.

81889982255831 is a deficient number, since it is larger than the sum of its proper divisors (2688040258969).

81889982255831 is a wasteful number, since it uses less digits than its factorization.

81889982255831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21165671425.

The product of its digits is 796262400, while the sum is 77.

The spelling of 81889982255831 in words is "eighty-one trillion, eight hundred eighty-nine billion, nine hundred eighty-two million, two hundred fifty-five thousand, eight hundred thirty-one".