20566668201 has 4 divisors (see below), whose sum is σ = 27422224272. Its totient is φ = 13711112132.

The previous prime is 20566668191. The next prime is 20566668217. The reversal of 20566668201 is 10286666502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20566668201 - 2¹⁴ = 20566651817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20566668281) 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, 3427778031 + ... + 3427778036.

It is an arithmetic number, because the mean of its divisors is an integer number (6855556068).

Almost surely, 2^20566668201 is an apocalyptic number.

It is an amenable number.

20566668201 is a deficient number, since it is larger than the sum of its proper divisors (6855556071).

20566668201 is an equidigital number, since it uses as much as digits as its factorization.

20566668201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6855556070.

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 20566668201 in words is "twenty billion, five hundred sixty-six million, six hundred sixty-eight thousand, two hundred one".