81080001887888 has 20 divisors (see below), whose sum is σ = 157335305074560. Its totient is φ = 40477342513824.

The previous prime is 81080001887887. The next prime is 81080001887893. The reversal of 81080001887888 is 88878810008018.

It is a super-2 number, since 2×81080001887888² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81080001887887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3916141208 + ... + 3916161911.

It is an arithmetic number, because the mean of its divisors is an integer number (7866765253728).

Almost surely, 2^{81080001887888} is an apocalyptic number.

It is an amenable number.

81080001887888 is a deficient number, since it is larger than the sum of its proper divisors (76255303186672).

81080001887888 is a wasteful number, since it uses less digits than its factorization.

81080001887888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7832303774 (or 7832303768 counting only the distinct ones).

The product of its (nonzero) digits is 14680064, while the sum is 65.

The spelling of 81080001887888 in words is "eighty-one trillion, eighty billion, one million, eight hundred eighty-seven thousand, eight hundred eighty-eight".