81376017647 has 8 divisors (see below), whose sum is σ = 81437756400. Its totient is φ = 81314306944.

The previous prime is 81376017623. The next prime is 81376017659. The reversal of 81376017647 is 74671067318.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81376017647 - 2⁸ = 81376017391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81376017595 and 81376017604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81376010647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13699004 + ... + 13704942.

It is an arithmetic number, because the mean of its divisors is an integer number (10179719550).

Almost surely, 2^81376017647 is an apocalyptic number.

81376017647 is a deficient number, since it is larger than the sum of its proper divisors (61738753).

81376017647 is a wasteful number, since it uses less digits than its factorization.

81376017647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14025.

The product of its (nonzero) digits is 1185408, while the sum is 50.

The spelling of 81376017647 in words is "eighty-one billion, three hundred seventy-six million, seventeen thousand, six hundred forty-seven".