266196222691661 has 8 divisors (see below), whose sum is σ = 266893430077440. Its totient is φ = 265499026650832.

The previous prime is 266196222691657. The next prime is 266196222691673. The reversal of 266196222691661 is 166196222691662.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 266196222691661 - 2² = 266196222691657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266196222691561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45217655 + ... + 50764443.

It is an arithmetic number, because the mean of its divisors is an integer number (33361678759680).

Almost surely, 2^{266196222691661} is an apocalyptic number.

It is an amenable number.

266196222691661 is a deficient number, since it is larger than the sum of its proper divisors (697207385779).

266196222691661 is a wasteful number, since it uses less digits than its factorization.

266196222691661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672475.

The product of its digits is 60466176, while the sum is 65.

Subtracting from 266196222691661 its reverse (166196222691662), we obtain a palindrome (99999999999999).

The spelling of 266196222691661 in words is "two hundred sixty-six trillion, one hundred ninety-six billion, two hundred twenty-two million, six hundred ninety-one thousand, six hundred sixty-one".