81580352172222 has 16 divisors (see below), whose sum is σ = 163653636989952. Its totient is φ = 27111295283160.

The previous prime is 81580352172217. The next prime is 81580352172227. The reversal of 81580352172222 is 22227125308518.

It is an interprime number because it is at equal distance from previous prime (81580352172217) and next prime (81580352172227).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81580352172227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20538858078 + ... + 20538862049.

It is an arithmetic number, because the mean of its divisors is an integer number (10228352311872).

Almost surely, 2^{81580352172222} is an apocalyptic number.

81580352172222 is an abundant number, since it is smaller than the sum of its proper divisors (82073284817730).

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

81580352172222 is a wasteful number, since it uses less digits than its factorization.

81580352172222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41077720463.

The product of its (nonzero) digits is 1075200, while the sum is 48.

The spelling of 81580352172222 in words is "eighty-one trillion, five hundred eighty billion, three hundred fifty-two million, one hundred seventy-two thousand, two hundred twenty-two".