81223494360 has 64 divisors (see below), whose sum is σ = 244155098880. Its totient is φ = 21616521600.

The previous prime is 81223494343. The next prime is 81223494377. The reversal of 81223494360 is 6349432218.

It is an interprime number because it is at equal distance from previous prime (81223494343) and next prime (81223494377).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 612466 + ... + 733185.

It is an arithmetic number, because the mean of its divisors is an integer number (3814923420).

Almost surely, 2^81223494360 is an apocalyptic number.

It is an amenable number.

81223494360 is an abundant number, since it is smaller than the sum of its proper divisors (162931604520).

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

81223494360 is a wasteful number, since it uses less digits than its factorization.

81223494360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346168 (or 1346164 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The spelling of 81223494360 in words is "eighty-one billion, two hundred twenty-three million, four hundred ninety-four thousand, three hundred sixty".