81782432051 has 4 divisors (see below), whose sum is σ = 86086770600. Its totient is φ = 77478093504.

The previous prime is 81782432047. The next prime is 81782432063. The reversal of 81782432051 is 15023428718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81782432051 - 2² = 81782432047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81782432071) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2152169246 + ... + 2152169283.

It is an arithmetic number, because the mean of its divisors is an integer number (21521692650).

Almost surely, 2^81782432051 is an apocalyptic number.

81782432051 is a deficient number, since it is larger than the sum of its proper divisors (4304338549).

81782432051 is a wasteful number, since it uses less digits than its factorization.

81782432051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4304338548.

The product of its (nonzero) digits is 107520, while the sum is 41.

The spelling of 81782432051 in words is "eighty-one billion, seven hundred eighty-two million, four hundred thirty-two thousand, fifty-one".