81432177822 has 32 divisors (see below), whose sum is σ = 183509141760. Its totient is φ = 26761747320.

The previous prime is 81432177817. The next prime is 81432177923. The reversal of 81432177822 is 22877123418.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10615908 + ... + 10623575.

It is an arithmetic number, because the mean of its divisors is an integer number (5734660680).

Almost surely, 2^81432177822 is an apocalyptic number.

81432177822 is an abundant number, since it is smaller than the sum of its proper divisors (102076963938).

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

81432177822 is a wasteful number, since it uses less digits than its factorization.

81432177822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21239565 (or 21239559 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The spelling of 81432177822 in words is "eighty-one billion, four hundred thirty-two million, one hundred seventy-seven thousand, eight hundred twenty-two".