2221561895966 has 32 divisors (see below), whose sum is σ = 4010357295360. Its totient is φ = 901644682176.

The previous prime is 2221561895939. The next prime is 2221561896011. The reversal of 2221561895966 is 6695981651222.

It is a junction number, because it is equal to n+sod(n) for n = 2221561895899 and 2221561895908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 885596 + ... + 2286351.

It is an arithmetic number, because the mean of its divisors is an integer number (125323665480).

Almost surely, 2^{2221561895966} is an apocalyptic number.

2221561895966 is a deficient number, since it is larger than the sum of its proper divisors (1788795399394).

2221561895966 is a wasteful number, since it uses less digits than its factorization.

2221561895966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174608.

The product of its digits is 27993600, while the sum is 62.

The spelling of 2221561895966 in words is "two trillion, two hundred twenty-one billion, five hundred sixty-one million, eight hundred ninety-five thousand, nine hundred sixty-six".