81413340140 has 24 divisors (see below), whose sum is σ = 186510561552. Its totient is φ = 29604850880.

The previous prime is 81413340133. The next prime is 81413340193. The reversal of 81413340140 is 4104331418.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185030099 + ... + 185030538.

It is an arithmetic number, because the mean of its divisors is an integer number (7771273398).

Almost surely, 2^81413340140 is an apocalyptic number.

It is an amenable number.

81413340140 is an abundant number, since it is smaller than the sum of its proper divisors (105097221412).

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

81413340140 is a wasteful number, since it uses less digits than its factorization.

81413340140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370060657 (or 370060655 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 81413340140 its reverse (4104331418), we get a palindrome (85517671558).

The spelling of 81413340140 in words is "eighty-one billion, four hundred thirteen million, three hundred forty thousand, one hundred forty".