81151844576 has 24 divisors (see below), whose sum is σ = 174292030584. Its totient is φ = 36887201920.

The previous prime is 81151844573. The next prime is 81151844639. The reversal of 81151844576 is 67544815118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81151844573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115272155 + ... + 115272858.

It is an arithmetic number, because the mean of its divisors is an integer number (7262167941).

Almost surely, 2^81151844576 is an apocalyptic number.

It is an amenable number.

81151844576 is an abundant number, since it is smaller than the sum of its proper divisors (93140186008).

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

81151844576 is a wasteful number, since it uses less digits than its factorization.

81151844576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230545034 (or 230545026 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 50.

The spelling of 81151844576 in words is "eighty-one billion, one hundred fifty-one million, eight hundred forty-four thousand, five hundred seventy-six".