81172223022 has 32 divisors (see below), whose sum is σ = 177304184064. Its totient is φ = 24569705600.

The previous prime is 81172223003. The next prime is 81172223057. The reversal of 81172223022 is 22032227118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 639858 + ... + 756149.

It is an arithmetic number, because the mean of its divisors is an integer number (5540755752).

Almost surely, 2^81172223022 is an apocalyptic number.

81172223022 is an abundant number, since it is smaller than the sum of its proper divisors (96131961042).

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

81172223022 is a wasteful number, since it uses less digits than its factorization.

81172223022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396904.

The product of its (nonzero) digits is 5376, while the sum is 30.

The spelling of 81172223022 in words is "eighty-one billion, one hundred seventy-two million, two hundred twenty-three thousand, twenty-two".