2166570565221 has 8 divisors (see below), whose sum is σ = 3014359047360. Its totient is φ = 1381581229952.

The previous prime is 2166570565219. The next prime is 2166570565249. The reversal of 2166570565221 is 1225650756612.

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

It is a cyclic number.

It is not a de Polignac number, because 2166570565221 - 2¹ = 2166570565219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166570567221) 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, 15699786636 + ... + 15699786773.

It is an arithmetic number, because the mean of its divisors is an integer number (376794880920).

Almost surely, 2^{2166570565221} is an apocalyptic number.

It is an amenable number.

2166570565221 is a deficient number, since it is larger than the sum of its proper divisors (847788482139).

2166570565221 is a wasteful number, since it uses less digits than its factorization.

2166570565221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31399573435.

The product of its (nonzero) digits is 1512000, while the sum is 48.

The spelling of 2166570565221 in words is "two trillion, one hundred sixty-six billion, five hundred seventy million, five hundred sixty-five thousand, two hundred twenty-one".