99999516305663 has 16 divisors (see below), whose sum is σ = 109625942630400. Its totient is φ = 90661633002720.

The previous prime is 99999516305629. The next prime is 99999516305699. The reversal of 99999516305663 is 36650361599999.

It is not a de Polignac number, because 99999516305663 - 2⁸ = 99999516305407 is a prime.

It is a super-2 number, since 2×99999516305663² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (80) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999516304663) 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, 254700473 + ... + 255092786.

It is an arithmetic number, because the mean of its divisors is an integer number (6851621414400).

Almost surely, 2^{99999516305663} is an apocalyptic number.

99999516305663 is a deficient number, since it is larger than the sum of its proper divisors (9626426324737).

99999516305663 is a wasteful number, since it uses less digits than its factorization.

99999516305663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509793542.

The product of its (nonzero) digits is 2869781400, while the sum is 80.

The spelling of 99999516305663 in words is "ninety-nine trillion, nine hundred ninety-nine billion, five hundred sixteen million, three hundred five thousand, six hundred sixty-three".