99851815899 has 72 divisors (see below), whose sum is σ = 163049236896. Its totient is φ = 58797446400.

The previous prime is 99851815897. The next prime is 99851815901.

99851815899 is a `hidden beast` number, since 9 + 9 + 8 + 518 + 15 + 8 + 99 = 666.

99851815899 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (99851815897) and next prime (99851815901).

It is not a de Polignac number, because 99851815899 - 2¹ = 99851815897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99851815897) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 39606759 + ... + 39609279.

Almost surely, 2^99851815899 is an apocalyptic number.

99851815899 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

99851815899 is a deficient number, since it is larger than the sum of its proper divisors (63197420997).

99851815899 is a wasteful number, since it uses less digits than its factorization.

99851815899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3569 (or 3555 counting only the distinct ones).

The product of its digits is 83980800, while the sum is 72.

The spelling of 99851815899 in words is "ninety-nine billion, eight hundred fifty-one million, eight hundred fifteen thousand, eight hundred ninety-nine".