16521011493 has 16 divisors (see below), whose sum is σ = 25180356096. Its totient is φ = 9438522480.

The previous prime is 16521011491. The next prime is 16521011497. The reversal of 16521011493 is 39411012561.

16521011493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16521011493 - 2¹ = 16521011491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16521011491) 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 15 ways as a sum of consecutive naturals, for example, 15898 + ... + 182468.

It is an arithmetic number, because the mean of its divisors is an integer number (1573772256).

Almost surely, 2^16521011493 is an apocalyptic number.

It is an amenable number.

16521011493 is a deficient number, since it is larger than the sum of its proper divisors (8659344603).

16521011493 is a wasteful number, since it uses less digits than its factorization.

16521011493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171304.

The product of its (nonzero) digits is 6480, while the sum is 33.

The spelling of 16521011493 in words is "sixteen billion, five hundred twenty-one million, eleven thousand, four hundred ninety-three".