81325745340 has 192 divisors, whose sum is σ = 273043857408. Its totient is φ = 17694028800.

The previous prime is 81325745297. The next prime is 81325745377. The reversal of 81325745340 is 4354752318.

It is a super-2 number, since 2×81325745340² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 81325745292 and 81325745301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 743022 + ... + 845418.

It is an arithmetic number, because the mean of its divisors is an integer number (1422103424).

Almost surely, 2^81325745340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81325745340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136521928704).

81325745340 is an abundant number, since it is smaller than the sum of its proper divisors (191718112068).

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

81325745340 is a wasteful number, since it uses less digits than its factorization.

81325745340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102508 (or 102506 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 81325745340 in words is "eighty-one billion, three hundred twenty-five million, seven hundred forty-five thousand, three hundred forty".