93809991861 has 32 divisors (see below), whose sum is σ = 140997795840. Its totient is φ = 61631766000.

The previous prime is 93809991857. The next prime is 93809991881. The reversal of 93809991861 is 16819990839.

93809991861 is a `hidden beast` number, since 9 + 380 + 99 + 91 + 86 + 1 = 666.

It is not a de Polignac number, because 93809991861 - 2² = 93809991857 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (93809991881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4880676 + ... + 4899858.

It is an arithmetic number, because the mean of its divisors is an integer number (4406181120).

Almost surely, 2^93809991861 is an apocalyptic number.

It is an amenable number.

93809991861 is a deficient number, since it is larger than the sum of its proper divisors (47187803979).

93809991861 is a wasteful number, since it uses less digits than its factorization.

93809991861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21814 (or 21808 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 63.

The spelling of 93809991861 in words is "ninety-three billion, eight hundred nine million, nine hundred ninety-one thousand, eight hundred sixty-one".