99861616899 has 72 divisors (see below), whose sum is σ = 165474429120. Its totient is φ = 57916024320.

The previous prime is 99861616847. The next prime is 99861616901.

99861616899 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99861616899 - 2¹² = 99861612803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99861617899) 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, 3554662 + ... + 3582644.

It is an arithmetic number, because the mean of its divisors is an integer number (2298255960).

Almost surely, 2^99861616899 is an apocalyptic number.

99861616899 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

99861616899 is a deficient number, since it is larger than the sum of its proper divisors (65612812221).

99861616899 is a wasteful number, since it uses less digits than its factorization.

99861616899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28153 (or 28139 counting only the distinct ones).

The product of its digits is 90699264, while the sum is 72.

The spelling of 99861616899 in words is "ninety-nine billion, eight hundred sixty-one million, six hundred sixteen thousand, eight hundred ninety-nine".