196865566 has 4 divisors (see below), whose sum is σ = 295298352. Its totient is φ = 98432782.

The previous prime is 196865489. The next prime is 196865569. The reversal of 196865566 is 665568691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 665568691 = 37 ⋅17988343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196865569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49216390 + ... + 49216393.

It is an arithmetic number, because the mean of its divisors is an integer number (73824588).

Almost surely, 2^196865566 is an apocalyptic number.

196865566 is a deficient number, since it is larger than the sum of its proper divisors (98432786).

196865566 is an equidigital number, since it uses as much as digits as its factorization.

196865566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98432785.

The product of its digits is 2332800, while the sum is 52.

The square root of 196865566 is about 14030.8790173674. The cubic root of 196865566 is about 581.7324006065.

It can be divided in two parts, 19686 and 5566, that added together give a palindrome (25252).

The spelling of 196865566 in words is "one hundred ninety-six million, eight hundred sixty-five thousand, five hundred sixty-six".