66552806 has 4 divisors (see below), whose sum is σ = 99829212. Its totient is φ = 33276402.

The previous prime is 66552749. The next prime is 66552809. The reversal of 66552806 is 60825566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66552806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66552809) 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, 16638200 + ... + 16638203.

It is an arithmetic number, because the mean of its divisors is an integer number (24957303).

Almost surely, 2^66552806 is an apocalyptic number.

66552806 is a deficient number, since it is larger than the sum of its proper divisors (33276406).

66552806 is a wasteful number, since it uses less digits than its factorization.

66552806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33276405.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 66552806 is about 8157.9903162482. The cubic root of 66552806 is about 405.2491603034.

The spelling of 66552806 in words is "sixty-six million, five hundred fifty-two thousand, eight hundred six".