16599536449 has 4 divisors (see below), whose sum is σ = 16604025300. Its totient is φ = 16595047600.

The previous prime is 16599536441. The next prime is 16599536483. The reversal of 16599536449 is 94463599561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8564206849 + 8035329600 = 92543^2 + 89640^2 .

It is a cyclic number.

It is not a de Polignac number, because 16599536449 - 2³ = 16599536441 is a prime.

It is a super-2 number, since 2×16599536449² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16599536441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2238874 + ... + 2246275.

It is an arithmetic number, because the mean of its divisors is an integer number (4151006325).

Almost surely, 2^16599536449 is an apocalyptic number.

It is an amenable number.

16599536449 is a deficient number, since it is larger than the sum of its proper divisors (4488851).

16599536449 is an equidigital number, since it uses as much as digits as its factorization.

16599536449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4488850.

The product of its digits is 31492800, while the sum is 61.

The spelling of 16599536449 in words is "sixteen billion, five hundred ninety-nine million, five hundred thirty-six thousand, four hundred forty-nine".