81942588976 has 10 divisors (see below), whose sum is σ = 158763766172. Its totient is φ = 40971294480.

The previous prime is 81942588961. The next prime is 81942588977. The reversal of 81942588976 is 67988524918.

It is not an unprimeable number, because it can be changed into a prime (81942588977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2560705890 + ... + 2560705921.

Almost surely, 2^81942588976 is an apocalyptic number.

It is an amenable number.

81942588976 is a deficient number, since it is larger than the sum of its proper divisors (76821177196).

81942588976 is a wasteful number, since it uses less digits than its factorization.

81942588976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5121411819 (or 5121411813 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 67.

The spelling of 81942588976 in words is "eighty-one billion, nine hundred forty-two million, five hundred eighty-eight thousand, nine hundred seventy-six".