81701855888 has 20 divisors (see below), whose sum is σ = 158342798448. Its totient is φ = 40839198240.

The previous prime is 81701855887. The next prime is 81701855941. The reversal of 81701855888 is 88855810718.

It is not an unprimeable number, because it can be changed into a prime (81701855881) 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, 675506 + ... + 787217.

Almost surely, 2^81701855888 is an apocalyptic number.

It is an amenable number.

81701855888 is a deficient number, since it is larger than the sum of its proper divisors (76640942560).

81701855888 is a wasteful number, since it uses less digits than its factorization.

81701855888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466222 (or 1466216 counting only the distinct ones).

The product of its (nonzero) digits is 5734400, while the sum is 59.

The spelling of 81701855888 in words is "eighty-one billion, seven hundred one million, eight hundred fifty-five thousand, eight hundred eighty-eight".