2021065536566 has 8 divisors (see below), whose sum is σ = 3136136177520. Its totient is φ = 975686810728.

The previous prime is 2021065536563. The next prime is 2021065536641. The reversal of 2021065536566 is 6656355601202.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2021065536566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021065536563) 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, 17422978706 + ... + 17422978821.

It is an arithmetic number, because the mean of its divisors is an integer number (392017022190).

Almost surely, 2^{2021065536566} is an apocalyptic number.

2021065536566 is a deficient number, since it is larger than the sum of its proper divisors (1115070640954).

2021065536566 is a wasteful number, since it uses less digits than its factorization.

2021065536566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34845957558.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 2021065536566 in words is "two trillion, twenty-one billion, sixty-five million, five hundred thirty-six thousand, five hundred sixty-six".