16545652432421 has 16 divisors (see below), whose sum is σ = 19564880150400. Its totient is φ = 13690491369408.

The previous prime is 16545652432417. The next prime is 16545652432423. The reversal of 16545652432421 is 12423425654561.

It is not a de Polignac number, because 16545652432421 - 2² = 16545652432417 is a prime.

It is a super-2 number, since 2×16545652432421² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16545652432421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16545652432423) 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 15 ways as a sum of consecutive naturals, for example, 6196406 + ... + 8454983.

It is an arithmetic number, because the mean of its divisors is an integer number (1222805009400).

Almost surely, 2^{16545652432421} is an apocalyptic number.

It is an amenable number.

16545652432421 is a deficient number, since it is larger than the sum of its proper divisors (3019227717979).

16545652432421 is a wasteful number, since it uses less digits than its factorization.

16545652432421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14656988.

The product of its digits is 6912000, while the sum is 50.

The spelling of 16545652432421 in words is "sixteen trillion, five hundred forty-five billion, six hundred fifty-two million, four hundred thirty-two thousand, four hundred twenty-one".