81594348654 has 128 divisors (see below), whose sum is σ = 203224412160. Its totient is φ = 21265804800.

The previous prime is 81594348629. The next prime is 81594348659. The reversal of 81594348654 is 45684349518.

It is a super-2 number, since 2×81594348654² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81594348594 and 81594348603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81594348659) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25648944 + ... + 25652124.

It is an arithmetic number, because the mean of its divisors is an integer number (1587690720).

Almost surely, 2^81594348654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81594348654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101612206080).

81594348654 is an abundant number, since it is smaller than the sum of its proper divisors (121630063506).

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

81594348654 is a wasteful number, since it uses less digits than its factorization.

81594348654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3746.

The product of its digits is 16588800, while the sum is 57.

The spelling of 81594348654 in words is "eighty-one billion, five hundred ninety-four million, three hundred forty-eight thousand, six hundred fifty-four".