66606202446221 has 4 divisors (see below), whose sum is σ = 66607138378944. Its totient is φ = 66605266513500.

The previous prime is 66606202446209. The next prime is 66606202446229. The reversal of 66606202446221 is 12264420260666.

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 66606202446221 - 2³⁰ = 66605128704397 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 (66606202446229) 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, 467859605 + ... + 468001946.

It is an arithmetic number, because the mean of its divisors is an integer number (16651784594736).

Almost surely, 2^{66606202446221} is an apocalyptic number.

It is an amenable number.

66606202446221 is a deficient number, since it is larger than the sum of its proper divisors (935932723).

66606202446221 is an equidigital number, since it uses as much as digits as its factorization.

66606202446221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935932722.

The product of its (nonzero) digits is 1990656, while the sum is 47.

The spelling of 66606202446221 in words is "sixty-six trillion, six hundred six billion, two hundred two million, four hundred forty-six thousand, two hundred twenty-one".