81542248170 has 32 divisors (see below), whose sum is σ = 195851682432. Its totient is φ = 21727900992.

The previous prime is 81542248163. The next prime is 81542248171. The reversal of 81542248170 is 7184224518.

It is not an unprimeable number, because it can be changed into a prime (81542248171) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1003917 + ... + 1082096.

It is an arithmetic number, because the mean of its divisors is an integer number (6120365076).

Almost surely, 2^81542248170 is an apocalyptic number.

81542248170 is an abundant number, since it is smaller than the sum of its proper divisors (114309434262).

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

81542248170 is a wasteful number, since it uses less digits than its factorization.

81542248170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087326.

The product of its (nonzero) digits is 143360, while the sum is 42.

The spelling of 81542248170 in words is "eighty-one billion, five hundred forty-two million, two hundred forty-eight thousand, one hundred seventy".