81464422181782 has 8 divisors (see below), whose sum is σ = 122196684755376. Its totient is φ = 40732193929992.

The previous prime is 81464422181749. The next prime is 81464422181783. The reversal of 81464422181782 is 28718122446418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81464422181783) 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, 1467193 + ... + 12848404.

It is an arithmetic number, because the mean of its divisors is an integer number (15274585594422).

Almost surely, 2^{81464422181782} is an apocalyptic number.

81464422181782 is a deficient number, since it is larger than the sum of its proper divisors (40732262573594).

81464422181782 is a wasteful number, since it uses less digits than its factorization.

81464422181782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17160902.

The product of its digits is 11010048, while the sum is 58.

The spelling of 81464422181782 in words is "eighty-one trillion, four hundred sixty-four billion, four hundred twenty-two million, one hundred eighty-one thousand, seven hundred eighty-two".