81254542430881 has 16 divisors (see below), whose sum is σ = 85616672843520. Its totient is φ = 76961630718720.

The previous prime is 81254542430849. The next prime is 81254542430899. The reversal of 81254542430881 is 18803424545218.

It is not a de Polignac number, because 81254542430881 - 2⁵ = 81254542430849 is a prime.

It is a super-2 number, since 2×81254542430881² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81254542430681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31963141 + ... + 34411501.

It is an arithmetic number, because the mean of its divisors is an integer number (5351042052720).

Almost surely, 2^{81254542430881} is an apocalyptic number.

It is an amenable number.

81254542430881 is a deficient number, since it is larger than the sum of its proper divisors (4362130412639).

81254542430881 is a wasteful number, since it uses less digits than its factorization.

81254542430881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462496.

The product of its (nonzero) digits is 9830400, while the sum is 55.

The spelling of 81254542430881 in words is "eighty-one trillion, two hundred fifty-four billion, five hundred forty-two million, four hundred thirty thousand, eight hundred eighty-one".