81424167724 has 6 divisors (see below), whose sum is σ = 142492293524. Its totient is φ = 40712083860.

The previous prime is 81424167707. The next prime is 81424167757. The reversal of 81424167724 is 42776142418.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178020962 + ... + 10178020969.

Almost surely, 2^81424167724 is an apocalyptic number.

It is an amenable number.

81424167724 is a deficient number, since it is larger than the sum of its proper divisors (61068125800).

81424167724 is a wasteful number, since it uses less digits than its factorization.

81424167724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20356041935 (or 20356041933 counting only the distinct ones).

The product of its digits is 602112, while the sum is 46.

The spelling of 81424167724 in words is "eighty-one billion, four hundred twenty-four million, one hundred sixty-seven thousand, seven hundred twenty-four".