128081563316281 has 32 divisors (see below), whose sum is σ = 139725051383808. Its totient is φ = 117075877490880.

The previous prime is 128081563316251. The next prime is 128081563316293. The reversal of 128081563316281 is 182613365180821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 128081563316281 - 2⁴¹ = 125882540060729 is a prime.

It is a super-3 number, since 3×128081563316281³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128081563316251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11860650 + ... + 19920796.

It is an arithmetic number, because the mean of its divisors is an integer number (4366407855744).

Almost surely, 2^{128081563316281} is an apocalyptic number.

It is an amenable number.

128081563316281 is a deficient number, since it is larger than the sum of its proper divisors (11643488067527).

128081563316281 is a wasteful number, since it uses less digits than its factorization.

128081563316281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8060541.

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 128081563316281 in words is "one hundred twenty-eight trillion, eighty-one billion, five hundred sixty-three million, three hundred sixteen thousand, two hundred eighty-one".