81376471058561 has 8 divisors (see below), whose sum is σ = 93001745495424. Its totient is φ = 69751212693120.

The previous prime is 81376471058557. The next prime is 81376471058587. The reversal of 81376471058561 is 16585017467318.

It is a happy number.

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

It is not a de Polignac number, because 81376471058561 - 2² = 81376471058557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81376471058494 and 81376471058503.

It is not an unprimeable number, because it can be changed into a prime (81376471058761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10174481 + ... + 16317873.

It is an arithmetic number, because the mean of its divisors is an integer number (11625218186928).

Almost surely, 2^{81376471058561} is an apocalyptic number.

It is an amenable number.

81376471058561 is a deficient number, since it is larger than the sum of its proper divisors (11625274436863).

81376471058561 is a wasteful number, since it uses less digits than its factorization.

81376471058561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8035711.

The product of its (nonzero) digits is 33868800, while the sum is 62.

The spelling of 81376471058561 in words is "eighty-one trillion, three hundred seventy-six billion, four hundred seventy-one million, fifty-eight thousand, five hundred sixty-one".