81542248122 has 8 divisors (see below), whose sum is σ = 163084496256. Its totient is φ = 27180749372.

The previous prime is 81542248097. The next prime is 81542248153. The reversal of 81542248122 is 22184224518.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

81542248122 is an admirable 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 3 ways as a sum of consecutive naturals, for example, 6795187338 + ... + 6795187349.

It is an arithmetic number, because the mean of its divisors is an integer number (20385562032).

Almost surely, 2^81542248122 is an apocalyptic number.

81542248122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81542248122 is a wasteful number, since it uses less digits than its factorization.

81542248122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13590374692.

The product of its digits is 81920, while the sum is 39.

The spelling of 81542248122 in words is "eighty-one billion, five hundred forty-two million, two hundred forty-eight thousand, one hundred twenty-two".