81856079094 has 32 divisors (see below), whose sum is σ = 172237728096. Its totient is φ = 25900404480.

The previous prime is 81856079059. The next prime is 81856079099. The reversal of 81856079094 is 49097065818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81856079099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4487497 + ... + 4505700.

It is an arithmetic number, because the mean of its divisors is an integer number (5382429003).

Almost surely, 2^81856079094 is an apocalyptic number.

81856079094 is an abundant number, since it is smaller than the sum of its proper divisors (90381649002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81856079094 is a wasteful number, since it uses less digits than its factorization.

81856079094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8993280.

The product of its (nonzero) digits is 4354560, while the sum is 57.

The spelling of 81856079094 in words is "eighty-one billion, eight hundred fifty-six million, seventy-nine thousand, ninety-four".