16564023454201 has 4 divisors (see below), whose sum is σ = 17011699763812. Its totient is φ = 16116347144592.

The previous prime is 16564023454159. The next prime is 16564023454213. The reversal of 16564023454201 is 10245432046561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12209189047225 + 4354834406976 = 3494165^2 + 2086824^2 .

It is a cyclic number.

It is not a de Polignac number, because 16564023454201 - 2¹⁵ = 16564023421433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16564023454001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223838154750 + ... + 223838154823.

It is an arithmetic number, because the mean of its divisors is an integer number (4252924940953).

Almost surely, 2^{16564023454201} is an apocalyptic number.

It is an amenable number.

16564023454201 is a deficient number, since it is larger than the sum of its proper divisors (447676309611).

16564023454201 is an equidigital number, since it uses as much as digits as its factorization.

16564023454201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447676309610.

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 16564023454201 in words is "sixteen trillion, five hundred sixty-four billion, twenty-three million, four hundred fifty-four thousand, two hundred one".