221666526562063 has 4 divisors (see below), whose sum is σ = 241818028976808. Its totient is φ = 201515024147320.

The previous prime is 221666526562051. The next prime is 221666526562109. The reversal of 221666526562063 is 360265625666122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221666526562063 - 2⁵ = 221666526562031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221666526561989 and 221666526562007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221666526542063) 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, 10075751207356 + ... + 10075751207377.

It is an arithmetic number, because the mean of its divisors is an integer number (60454507244202).

Almost surely, 2^{221666526562063} is an apocalyptic number.

221666526562063 is a deficient number, since it is larger than the sum of its proper divisors (20151502414745).

221666526562063 is a wasteful number, since it uses less digits than its factorization.

221666526562063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20151502414744.

The product of its (nonzero) digits is 55987200, while the sum is 58.

The spelling of 221666526562063 in words is "two hundred twenty-one trillion, six hundred sixty-six billion, five hundred twenty-six million, five hundred sixty-two thousand, sixty-three".