66800899 has 8 divisors (see below), whose sum is σ = 73797120. Its totient is φ = 59958600.

The previous prime is 66800869. The next prime is 66800963. The reversal of 66800899 is 99800866.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66800899 is a prime.

66800899 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66800869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37567 + ... + 39304.

It is an arithmetic number, because the mean of its divisors is an integer number (9224640).

Almost surely, 2^66800899 is an apocalyptic number.

66800899 is a deficient number, since it is larger than the sum of its proper divisors (6996221).

66800899 is a wasteful number, since it uses less digits than its factorization.

66800899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76961.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 66800899 is about 8173.1816938081. The cubic root of 66800899 is about 405.7520933124.

The spelling of 66800899 in words is "sixty-six million, eight hundred thousand, eight hundred ninety-nine".