66267998 has 4 divisors (see below), whose sum is σ = 99402000. Its totient is φ = 33133998.

The previous prime is 66267997. The next prime is 66268003. The reversal of 66267998 is 89976266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89976266 = 2 ⋅44988133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66267997) 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 as a sum of consecutive naturals, namely, 16566998 + ... + 16567001.

It is an arithmetic number, because the mean of its divisors is an integer number (24850500).

Almost surely, 2^66267998 is an apocalyptic number.

66267998 is a deficient number, since it is larger than the sum of its proper divisors (33134002).

66267998 is a wasteful number, since it uses less digits than its factorization.

66267998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33134001.

The product of its digits is 1959552, while the sum is 53.

The square root of 66267998 is about 8140.5158313217. The cubic root of 66267998 is about 404.6702554023.

The spelling of 66267998 in words is "sixty-six million, two hundred sixty-seven thousand, nine hundred ninety-eight".