81230773885 has 8 divisors (see below), whose sum is σ = 97884783360. Its totient is φ = 64712715984.

The previous prime is 81230773879. The next prime is 81230773919. The reversal of 81230773885 is 58837703218.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81230773885 - 2⁹ = 81230773373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33986577 + ... + 33988966.

It is an arithmetic number, because the mean of its divisors is an integer number (12235597920).

Almost surely, 2^81230773885 is an apocalyptic number.

It is an amenable number.

81230773885 is a deficient number, since it is larger than the sum of its proper divisors (16654009475).

81230773885 is a wasteful number, since it uses less digits than its factorization.

81230773885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67975787.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 81230773885 in words is "eighty-one billion, two hundred thirty million, seven hundred seventy-three thousand, eight hundred eighty-five".