66196822916449 has 3 divisors (see below), whose sum is σ = 66196831052593. Its totient is φ = 66196814780306.

The previous prime is 66196822916423. The next prime is 66196822916509. The reversal of 66196822916449 is 94461922869166.

The square root of 66196822916449 is 8136143.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 66196822916449 - 2²³ = 66196814527841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66196822956449) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4068072 + ... + 12204214.

Almost surely, 2^{66196822916449} is an apocalyptic number.

66196822916449 is the 8136143-rd square number.

66196822916449 is the 4068072-nd centered octagonal number.

It is an amenable number.

66196822916449 is a deficient number, since it is larger than the sum of its proper divisors (8136144).

66196822916449 is an frugal number, since it uses more digits than its factorization.

66196822916449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16272286 (or 8136143 counting only the distinct ones).

The product of its digits is 483729408, while the sum is 73.

The spelling of 66196822916449 in words is "sixty-six trillion, one hundred ninety-six billion, eight hundred twenty-two million, nine hundred sixteen thousand, four hundred forty-nine".