2195917609566 has 32 divisors (see below), whose sum is σ = 4410290988576. Its totient is φ = 728896896000.

The previous prime is 2195917609559. The next prime is 2195917609583. The reversal of 2195917609566 is 6659067195912.

It is a super-2 number, since 2×2195917609566² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2195917609497 and 2195917609506.

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, 44716146 + ... + 44765226.

It is an arithmetic number, because the mean of its divisors is an integer number (137821593393).

Almost surely, 2^{2195917609566} is an apocalyptic number.

2195917609566 is an abundant number, since it is smaller than the sum of its proper divisors (2214373379010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2195917609566 is a wasteful number, since it uses less digits than its factorization.

2195917609566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80268.

The product of its (nonzero) digits is 55112400, while the sum is 66.

The spelling of 2195917609566 in words is "two trillion, one hundred ninety-five billion, nine hundred seventeen million, six hundred nine thousand, five hundred sixty-six".