66198973 has 8 divisors (see below), whose sum is σ = 67849056. Its totient is φ = 64554000.

The previous prime is 66198971. The next prime is 66198989. The reversal of 66198973 is 37989166.

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 66198973 - 2¹ = 66198971 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 (66198971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44898 + ... + 46348.

It is an arithmetic number, because the mean of its divisors is an integer number (8481132).

Almost surely, 2^66198973 is an apocalyptic number.

It is an amenable number.

66198973 is a deficient number, since it is larger than the sum of its proper divisors (1650083).

66198973 is a wasteful number, since it uses less digits than its factorization.

66198973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555.

The product of its digits is 489888, while the sum is 49.

The square root of 66198973 is about 8136.2751305496. The cubic root of 66198973 is about 404.5297045633.

The spelling of 66198973 in words is "sixty-six million, one hundred ninety-eight thousand, nine hundred seventy-three".