81342542472 has 32 divisors (see below), whose sum is σ = 204479882880. Its totient is φ = 26964377280.

The previous prime is 81342542467. The next prime is 81342542521. The reversal of 81342542472 is 27424524318.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9358288 + ... + 9366975.

It is an arithmetic number, because the mean of its divisors is an integer number (6389996340).

Almost surely, 2^81342542472 is an apocalyptic number.

It is an amenable number.

81342542472 is an abundant number, since it is smaller than the sum of its proper divisors (123137340408).

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

81342542472 is a wasteful number, since it uses less digits than its factorization.

81342542472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18725453 (or 18725449 counting only the distinct ones).

The product of its digits is 430080, while the sum is 42.

The spelling of 81342542472 in words is "eighty-one billion, three hundred forty-two million, five hundred forty-two thousand, four hundred seventy-two".