66198395456 has 28 divisors (see below), whose sum is σ = 131630044080. Its totient is φ = 33031770240.

The previous prime is 66198395401. The next prime is 66198395491. The reversal of 66198395456 is 65459389166.

It is a super-2 number, since 2×66198395456² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1021886 + ... + 1084733.

Almost surely, 2^66198395456 is an apocalyptic number.

It is an amenable number.

66198395456 is a deficient number, since it is larger than the sum of its proper divisors (65431648624).

66198395456 is a wasteful number, since it uses less digits than its factorization.

66198395456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107122 (or 2107112 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 62.

The spelling of 66198395456 in words is "sixty-six billion, one hundred ninety-eight million, three hundred ninety-five thousand, four hundred fifty-six".