16521733449 has 12 divisors (see below), whose sum is σ = 25700474436. Its totient is φ = 10167220512.

The previous prime is 16521733427. The next prime is 16521733471. The reversal of 16521733449 is 94433712561.

16521733449 is a `hidden beast` number, since 1 + 65 + 217 + 334 + 49 = 666.

16521733449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16521733427) and next prime (16521733471).

It can be written as a sum of positive squares in 2 ways, for example, as 5208220224 + 11313513225 = 72168^2 + 106365^2 .

It is not a de Polignac number, because 16521733449 - 2¹⁵ = 16521700681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16521733409) 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, 70605582 + ... + 70605815.

It is an arithmetic number, because the mean of its divisors is an integer number (2141706203).

Almost surely, 2^16521733449 is an apocalyptic number.

It is an amenable number.

16521733449 is a deficient number, since it is larger than the sum of its proper divisors (9178740987).

16521733449 is a wasteful number, since it uses less digits than its factorization.

16521733449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141211416 (or 141211413 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The spelling of 16521733449 in words is "sixteen billion, five hundred twenty-one million, seven hundred thirty-three thousand, four hundred forty-nine".