81700923889 has 8 divisors (see below), whose sum is σ = 88002351360. Its totient is φ = 75401888016.

The previous prime is 81700923881. The next prime is 81700923907. The reversal of 81700923889 is 98832900718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81700923889 - 2³ = 81700923881 is a prime.

It is a super-3 number, since 3×81700923889³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81700923881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526627 + ... + 663880.

It is an arithmetic number, because the mean of its divisors is an integer number (11000293920).

Almost surely, 2^81700923889 is an apocalyptic number.

It is an amenable number.

81700923889 is a deficient number, since it is larger than the sum of its proper divisors (6301427471).

81700923889 is a wasteful number, since it uses less digits than its factorization.

81700923889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195799.

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 81700923889 in words is "eighty-one billion, seven hundred million, nine hundred twenty-three thousand, eight hundred eighty-nine".