16564106263421 has 16 divisors (see below), whose sum is σ = 17461144546560. Its totient is φ = 15688880450880.

The previous prime is 16564106263417. The next prime is 16564106263423. The reversal of 16564106263421 is 12436260146561.

It is a cyclic number.

It is not a de Polignac number, because 16564106263421 - 2² = 16564106263417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16564106263423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9763286 + ... + 11333576.

It is an arithmetic number, because the mean of its divisors is an integer number (1091321534160).

Almost surely, 2^{16564106263421} is an apocalyptic number.

It is an amenable number.

16564106263421 is a deficient number, since it is larger than the sum of its proper divisors (897038283139).

16564106263421 is a wasteful number, since it uses less digits than its factorization.

16564106263421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577236.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 16564106263421 in words is "sixteen trillion, five hundred sixty-four billion, one hundred six million, two hundred sixty-three thousand, four hundred twenty-one".