221620066057 has 32 divisors (see below), whose sum is σ = 255504341120. Its totient is φ = 190511377920.

The previous prime is 221620066033. The next prime is 221620066061. The reversal of 221620066057 is 750660026122.

It is a cyclic number.

It is not a de Polignac number, because 221620066057 - 2⁷ = 221620065929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221620066027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32194738 + ... + 32201620.

It is an arithmetic number, because the mean of its divisors is an integer number (7984510660).

Almost surely, 2^221620066057 is an apocalyptic number.

It is an amenable number.

221620066057 is a deficient number, since it is larger than the sum of its proper divisors (33884275063).

221620066057 is a wasteful number, since it uses less digits than its factorization.

221620066057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9113.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 221620066057 in words is "two hundred twenty-one billion, six hundred twenty million, sixty-six thousand, fifty-seven".