81888967489 has 16 divisors (see below), whose sum is σ = 93881523456. Its totient is φ = 69970176000.

The previous prime is 81888967481. The next prime is 81888967579. The reversal of 81888967489 is 98476988818.

It is a cyclic number.

It is not a de Polignac number, because 81888967489 - 2³ = 81888967481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81888967481) 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, 4754884 + ... + 4772074.

It is an arithmetic number, because the mean of its divisors is an integer number (5867595216).

Almost surely, 2^81888967489 is an apocalyptic number.

It is an amenable number.

81888967489 is a deficient number, since it is larger than the sum of its proper divisors (11992555967).

81888967489 is a wasteful number, since it uses less digits than its factorization.

81888967489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19296.

The product of its digits is 445906944, while the sum is 76.

The spelling of 81888967489 in words is "eighty-one billion, eight hundred eighty-eight million, nine hundred sixty-seven thousand, four hundred eighty-nine".