99808641505 has 32 divisors (see below), whose sum is σ = 127166054400. Its totient is φ = 74990204352.

The previous prime is 99808641437. The next prime is 99808641521. The reversal of 99808641505 is 50514680899.

99808641505 is a nontrivial binomial coefficient, being equal to C(446786, 2).

It is a cyclic number.

It is not a de Polignac number, because 99808641505 - 2⁷ = 99808641377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21219984 + ... + 21224686.

It is an arithmetic number, because the mean of its divisors is an integer number (3973939200).

Almost surely, 2^99808641505 is an apocalyptic number.

99808641505 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

99808641505 is the 446785-th triangular number and also the 223393-rd hexagonal number.

99808641505 is the 148929-th centered nonagonal number.

It is an amenable number.

99808641505 is a deficient number, since it is larger than the sum of its proper divisors (27357412895).

99808641505 is a wasteful number, since it uses less digits than its factorization.

99808641505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6613.

The product of its (nonzero) digits is 3110400, while the sum is 55.

The spelling of 99808641505 in words is "ninety-nine billion, eight hundred eight million, six hundred forty-one thousand, five hundred five".