99999963 has 12 divisors (see below), whose sum is σ = 165079408. Its totient is φ = 57142800.

The previous prime is 99999959. The next prime is 99999971. The reversal of 99999963 is 36999999.

It is not a de Polignac number, because 99999963 - 2² = 99999959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 1587301 = 99999963 / (9 + 9 + 9 + 9 + 9 + 9 + 6 + 3).

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99999963.

It is not an unprimeable number, because it can be changed into a prime (99999563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 793588 + ... + 793713.

Almost surely, 2^99999963 is an apocalyptic number.

99999963 is a deficient number, since it is larger than the sum of its proper divisors (65079445).

99999963 is a wasteful number, since it uses less digits than its factorization.

99999963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587314 (or 1587311 counting only the distinct ones).

The product of its digits is 9565938, while the sum is 63.

The square root of 99999963 is about 9999.9981499998. The cubic root of 99999963 is about 464.1588261150.

Adding to 99999963 its product of digits (9565938), we get a palindrome (109565901).

It can be divided in two parts, 9999996 and 3, that added together give a palindrome (9999999).

The spelling of 99999963 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred sixty-three".