99999991144 has 32 divisors (see below), whose sum is σ = 187837977600. Its totient is φ = 49909953600.

The previous prime is 99999991129. The next prime is 99999991237. The reversal of 99999991144 is 44119999999.

It is a zygodrome in base 10.

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, 11309077 + ... + 11317915.

It is an arithmetic number, because the mean of its divisors is an integer number (5869936800).

Almost surely, 2^99999991144 is an apocalyptic number.

It is an amenable number.

99999991144 is a deficient number, since it is larger than the sum of its proper divisors (87837986456).

99999991144 is a wasteful number, since it uses less digits than its factorization.

99999991144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11233 (or 11229 counting only the distinct ones).

The product of its digits is 76527504, while the sum is 73.

The spelling of 99999991144 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-one thousand, one hundred forty-four".