221666001764570 has 16 divisors (see below), whose sum is σ = 435271421647008. Its totient is φ = 80605818823440.

The previous prime is 221666001764563. The next prime is 221666001764573. The reversal of 221666001764570 is 75467100666122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221666001764573) 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, 1007572735184 + ... + 1007572735403.

It is an arithmetic number, because the mean of its divisors is an integer number (27204463852938).

Almost surely, 2^{221666001764570} is an apocalyptic number.

221666001764570 is a deficient number, since it is larger than the sum of its proper divisors (213605419882438).

221666001764570 is a wasteful number, since it uses less digits than its factorization.

221666001764570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015145470605.

The product of its (nonzero) digits is 5080320, while the sum is 53.

The spelling of 221666001764570 in words is "two hundred twenty-one trillion, six hundred sixty-six billion, one million, seven hundred sixty-four thousand, five hundred seventy".