81387205322 has 16 divisors (see below), whose sum is σ = 131452917120. Its totient is φ = 37650710208.

The previous prime is 81387205307. The next prime is 81387205343. The reversal of 81387205322 is 22350278318.

It is a self number, because there is not a number n which added to its sum of digits gives 81387205322.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20283938 + ... + 20287949.

It is an arithmetic number, because the mean of its divisors is an integer number (8215807320).

Almost surely, 2^81387205322 is an apocalyptic number.

81387205322 is a deficient number, since it is larger than the sum of its proper divisors (50065711798).

81387205322 is a wasteful number, since it uses less digits than its factorization.

81387205322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40571965.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 81387205322 in words is "eighty-one billion, three hundred eighty-seven million, two hundred five thousand, three hundred twenty-two".