81742522170 has 32 divisors (see below), whose sum is σ = 196221579840. Its totient is φ = 21793614080.

The previous prime is 81742522163. The next prime is 81742522177. The reversal of 81742522170 is 7122524718.

It is an interprime number because it is at equal distance from previous prime (81742522163) and next prime (81742522177).

It is not an unprimeable number, because it can be changed into a prime (81742522177) 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 15 ways as a sum of consecutive naturals, for example, 121716 + ... + 422255.

It is an arithmetic number, because the mean of its divisors is an integer number (6131924370).

Almost surely, 2^81742522170 is an apocalyptic number.

81742522170 is an abundant number, since it is smaller than the sum of its proper divisors (114479057670).

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

81742522170 is a wasteful number, since it uses less digits than its factorization.

81742522170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548990.

The product of its (nonzero) digits is 62720, while the sum is 39.

The spelling of 81742522170 in words is "eighty-one billion, seven hundred forty-two million, five hundred twenty-two thousand, one hundred seventy".