81606882849 has 8 divisors (see below), whose sum is σ = 109476718752. Its totient is φ = 54070817760.

The previous prime is 81606882829. The next prime is 81606882923. The reversal of 81606882849 is 94828860618.

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

It is not a de Polignac number, because 81606882849 - 2⁵ = 81606882817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81606882792 and 81606882801.

It is not an unprimeable number, because it can be changed into a prime (81606882809) 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, 83442132 + ... + 83443109.

It is an arithmetic number, because the mean of its divisors is an integer number (13684589844).

Almost surely, 2^81606882849 is an apocalyptic number.

It is an amenable number.

81606882849 is a deficient number, since it is larger than the sum of its proper divisors (27869835903).

81606882849 is a wasteful number, since it uses less digits than its factorization.

81606882849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166885407.

The product of its (nonzero) digits is 10616832, while the sum is 60.

The spelling of 81606882849 in words is "eighty-one billion, six hundred six million, eight hundred eighty-two thousand, eight hundred forty-nine".