81576012325719 has 8 divisors (see below), whose sum is σ = 108772529164672. Its totient is φ = 54381751851960.

The previous prime is 81576012325679. The next prime is 81576012325783. The reversal of 81576012325719 is 91752321067518.

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

It is not a de Polignac number, because 81576012325719 - 2⁸ = 81576012325463 is a prime.

It is a super-2 number, since 2×81576012325719² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81576012325319) 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, 564006937 + ... + 564151554.

It is an arithmetic number, because the mean of its divisors is an integer number (13596566145584).

Almost surely, 2^{81576012325719} is an apocalyptic number.

81576012325719 is a deficient number, since it is larger than the sum of its proper divisors (27196516838953).

81576012325719 is a wasteful number, since it uses less digits than its factorization.

81576012325719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128182597.

The product of its (nonzero) digits is 6350400, while the sum is 57.

The spelling of 81576012325719 in words is "eighty-one trillion, five hundred seventy-six billion, twelve million, three hundred twenty-five thousand, seven hundred nineteen".