81369645284 has 12 divisors (see below), whose sum is σ = 142409468544. Its totient is φ = 40681225704.

The previous prime is 81369645283. The next prime is 81369645289. The reversal of 81369645284 is 48254696318.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (81369645283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 848012 + ... + 939075.

It is an arithmetic number, because the mean of its divisors is an integer number (11867455712).

Almost surely, 2^81369645284 is an apocalyptic number.

It is an amenable number.

81369645284 is a deficient number, since it is larger than the sum of its proper divisors (61039823260).

81369645284 is a wasteful number, since it uses less digits than its factorization.

81369645284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798474 (or 1798472 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 56.

The spelling of 81369645284 in words is "eighty-one billion, three hundred sixty-nine million, six hundred forty-five thousand, two hundred eighty-four".