81549542282 has 16 divisors (see below), whose sum is σ = 131886558720. Its totient is φ = 37594626672.

The previous prime is 81549542251. The next prime is 81549542303. The reversal of 81549542282 is 28224594518.

It is a self number, because there is not a number n which added to its sum of digits gives 81549542282.

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, 1794782 + ... + 1839657.

It is an arithmetic number, because the mean of its divisors is an integer number (8242909920).

Almost surely, 2^81549542282 is an apocalyptic number.

81549542282 is a deficient number, since it is larger than the sum of its proper divisors (50337016438).

81549542282 is a wasteful number, since it uses less digits than its factorization.

81549542282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3635317.

The product of its digits is 1843200, while the sum is 50.

The spelling of 81549542282 in words is "eighty-one billion, five hundred forty-nine million, five hundred forty-two thousand, two hundred eighty-two".