66814495226 has 4 divisors (see below), whose sum is σ = 100221742842. Its totient is φ = 33407247612.

The previous prime is 66814495217. The next prime is 66814495249. The reversal of 66814495226 is 62259441866.

It is a happy number.

It is a Cunningham number, because it is equal to 258485²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66814495225 + 1 = 258485^2 + 1^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16703623805 + ... + 16703623808.

Almost surely, 2^66814495226 is an apocalyptic number.

66814495226 is a deficient number, since it is larger than the sum of its proper divisors (33407247616).

66814495226 is a wasteful number, since it uses less digits than its factorization.

66814495226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33407247615.

The product of its digits is 4976640, while the sum is 53.

The spelling of 66814495226 in words is "sixty-six billion, eight hundred fourteen million, four hundred ninety-five thousand, two hundred twenty-six".