999990099999 has 48 divisors (see below), whose sum is σ = 1620132853248. Its totient is φ = 589090320000.

The previous prime is 999990099973. The next prime is 999990100001.

999990099999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 999990099999 - 2¹⁷ = 999989968927 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999990097999) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 645444 + ... + 1554534.

It is an arithmetic number, because the mean of its divisors is an integer number (33752767776).

Almost surely, 2^999990099999 is an apocalyptic number.

999990099999 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

999990099999 is a deficient number, since it is larger than the sum of its proper divisors (620142753249).

999990099999 is a wasteful number, since it uses less digits than its factorization.

999990099999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909420 (or 909417 counting only the distinct ones).

The product of its (nonzero) digits is 3486784401, while the sum is 90.

It can be divided in two parts, 9999900 and 99999, that multiplied together give a square (999980000100 = 999990²).

The spelling of 999990099999 in words is "nine hundred ninety-nine billion, nine hundred ninety million, ninety-nine thousand, nine hundred ninety-nine".