81106617646 has 8 divisors (see below), whose sum is σ = 122043712680. Its totient is φ = 40425380088.

The previous prime is 81106617601. The next prime is 81106617671. The reversal of 81106617646 is 64671660118.

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

It is a junction number, because it is equal to n+sod(n) for n = 81106617596 and 81106617605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63963576 + ... + 63964843.

It is an arithmetic number, because the mean of its divisors is an integer number (15255464085).

Almost surely, 2^81106617646 is an apocalyptic number.

81106617646 is a deficient number, since it is larger than the sum of its proper divisors (40937095034).

81106617646 is a wasteful number, since it uses less digits than its factorization.

81106617646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127928738.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 81106617646 in words is "eighty-one billion, one hundred six million, six hundred seventeen thousand, six hundred forty-six".