81073645926 has 64 divisors (see below), whose sum is σ = 199836940800. Its totient is φ = 21353020416.

The previous prime is 81073645841. The next prime is 81073645963. The reversal of 81073645926 is 62954637018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303030 + ... + 503958.

It is an arithmetic number, because the mean of its divisors is an integer number (3122452200).

It is a 1-persistent number, because it is pandigital, but 2⋅81073645926 = 162147291852 is not.

Almost surely, 2^81073645926 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81073645926, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99918470400).

81073645926 is an abundant number, since it is smaller than the sum of its proper divisors (118763294874).

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

81073645926 is a wasteful number, since it uses less digits than its factorization.

81073645926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201693.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 81073645926 in words is "eighty-one billion, seventy-three million, six hundred forty-five thousand, nine hundred twenty-six".