81542914736 has 10 divisors (see below), whose sum is σ = 157989397332. Its totient is φ = 40771457360.

The previous prime is 81542914729. The next prime is 81542914741. The reversal of 81542914736 is 63741924518.

It is a happy number.

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, 2548216070 + ... + 2548216101.

Almost surely, 2^81542914736 is an apocalyptic number.

It is an amenable number.

81542914736 is a deficient number, since it is larger than the sum of its proper divisors (76446482596).

81542914736 is a wasteful number, since it uses less digits than its factorization.

81542914736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5096432179 (or 5096432173 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 50.

The spelling of 81542914736 in words is "eighty-one billion, five hundred forty-two million, nine hundred fourteen thousand, seven hundred thirty-six".