16557420066599 has 8 divisors (see below), whose sum is σ = 17091914686080. Its totient is φ = 16022949465600.

The previous prime is 16557420066529. The next prime is 16557420066611. The reversal of 16557420066599 is 99566002475561.

16557420066599 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16557420066599 - 2³⁶ = 16488700589863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16557420066529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4598414 + ... + 7366155.

It is an arithmetic number, because the mean of its divisors is an integer number (2136489335760).

Almost surely, 2^{16557420066599} is an apocalyptic number.

16557420066599 is a deficient number, since it is larger than the sum of its proper divisors (534494619481).

16557420066599 is a wasteful number, since it uses less digits than its factorization.

16557420066599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12009241.

The product of its (nonzero) digits is 122472000, while the sum is 65.

The spelling of 16557420066599 in words is "sixteen trillion, five hundred fifty-seven billion, four hundred twenty million, sixty-six thousand, five hundred ninety-nine".