16604126449 has 3 divisors (see below), whose sum is σ = 16604255307. Its totient is φ = 16603997592.

The previous prime is 16604126447. The next prime is 16604126479. The reversal of 16604126449 is 94462140661.

The square root of 16604126449 is 128857.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 13166415025 + 3437711424 = 114745^2 + 58632^2 .

It is not a de Polignac number, because 16604126449 - 2¹ = 16604126447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16604126447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 64429 + ... + 193285.

It is an arithmetic number, because the mean of its divisors is an integer number (5534751769).

Almost surely, 2^16604126449 is an apocalyptic number.

16604126449 is the 128857-th square number.

16604126449 is the 64429-th centered octagonal number.

It is an amenable number.

16604126449 is a deficient number, since it is larger than the sum of its proper divisors (128858).

16604126449 is an frugal number, since it uses more digits than its factorization.

16604126449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257714 (or 128857 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 16604126449 in words is "sixteen billion, six hundred four million, one hundred twenty-six thousand, four hundred forty-nine".