81756376315 has 16 divisors (see below), whose sum is σ = 99133148736. Its totient is φ = 64723276800.

The previous prime is 81756376313. The next prime is 81756376333. The reversal of 81756376315 is 51367365718.

It is not a de Polignac number, because 81756376315 - 2¹ = 81756376313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81756376313) 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 15 ways as a sum of consecutive naturals, for example, 241855 + ... + 471175.

It is an arithmetic number, because the mean of its divisors is an integer number (6195821796).

Almost surely, 2^81756376315 is an apocalyptic number.

81756376315 is a deficient number, since it is larger than the sum of its proper divisors (17376772421).

81756376315 is a wasteful number, since it uses less digits than its factorization.

81756376315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230070.

The product of its digits is 3175200, while the sum is 52.

The spelling of 81756376315 in words is "eighty-one billion, seven hundred fifty-six million, three hundred seventy-six thousand, three hundred fifteen".