81576216732 has 24 divisors (see below), whose sum is σ = 190354122000. Its totient is φ = 27190698496.

The previous prime is 81576216731. The next prime is 81576216791. The reversal of 81576216732 is 23761267518.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81576216731) 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, 91894 + ... + 414242.

It is an arithmetic number, because the mean of its divisors is an integer number (7931421750).

Almost surely, 2^81576216732 is an apocalyptic number.

It is an amenable number.

81576216732 is an abundant number, since it is smaller than the sum of its proper divisors (108777905268).

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

81576216732 is a wasteful number, since it uses less digits than its factorization.

81576216732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343445 (or 343443 counting only the distinct ones).

The product of its digits is 846720, while the sum is 48.

The spelling of 81576216732 in words is "eighty-one billion, five hundred seventy-six million, two hundred sixteen thousand, seven hundred thirty-two".