81742522204 has 24 divisors (see below), whose sum is σ = 163497438720. Its totient is φ = 35029853616.

The previous prime is 81742522187. The next prime is 81742522207. The reversal of 81742522204 is 40222524718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81742522207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290817 + ... + 498055.

It is an arithmetic number, because the mean of its divisors is an integer number (6812393280).

Almost surely, 2^81742522204 is an apocalyptic number.

It is an amenable number.

81742522204 is an abundant number, since it is smaller than the sum of its proper divisors (81754916516).

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

81742522204 is a wasteful number, since it uses less digits than its factorization.

81742522204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221337 (or 221335 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 37.

The spelling of 81742522204 in words is "eighty-one billion, seven hundred forty-two million, five hundred twenty-two thousand, two hundred four".