81198795885 has 16 divisors (see below), whose sum is σ = 132682288896. Its totient is φ = 42384619328.

The previous prime is 81198795877. The next prime is 81198795901. The reversal of 81198795885 is 58859789118.

It is a cyclic number.

It is not a de Polignac number, because 81198795885 - 2³ = 81198795877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57587094 + ... + 57588503.

It is an arithmetic number, because the mean of its divisors is an integer number (8292643056).

Almost surely, 2^81198795885 is an apocalyptic number.

It is an amenable number.

81198795885 is a deficient number, since it is larger than the sum of its proper divisors (51483493011).

81198795885 is a wasteful number, since it uses less digits than its factorization.

81198795885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115175652.

The product of its digits is 58060800, while the sum is 69.

The spelling of 81198795885 in words is "eighty-one billion, one hundred ninety-eight million, seven hundred ninety-five thousand, eight hundred eighty-five".