99681823117 has 16 divisors (see below), whose sum is σ = 106055051200. Its totient is φ = 93422108160.

The previous prime is 99681823103. The next prime is 99681823121. The reversal of 99681823117 is 71132818699.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99681823117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99681823127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4890367 + ... + 4910707.

It is an arithmetic number, because the mean of its divisors is an integer number (6628440700).

Almost surely, 2^99681823117 is an apocalyptic number.

99681823117 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

99681823117 is the 182284-th hex number.

It is an amenable number.

99681823117 is a deficient number, since it is larger than the sum of its proper divisors (6373228083).

99681823117 is a wasteful number, since it uses less digits than its factorization.

99681823117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23116.

The product of its digits is 1306368, while the sum is 55.

The spelling of 99681823117 in words is "ninety-nine billion, six hundred eighty-one million, eight hundred twenty-three thousand, one hundred seventeen".