66552805 has 8 divisors (see below), whose sum is σ = 87123744. Its totient is φ = 48402000.

The previous prime is 66552749. The next prime is 66552809. The reversal of 66552805 is 50825566.

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

It is not a de Polignac number, because 66552805 - 2⁹ = 66552293 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 (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 in 7 ways as a sum of consecutive naturals, for example, 604971 + ... + 605080.

It is an arithmetic number, because the mean of its divisors is an integer number (10890468).

Almost surely, 2^66552805 is an apocalyptic number.

It is an amenable number.

66552805 is a deficient number, since it is larger than the sum of its proper divisors (20570939).

66552805 is a wasteful number, since it uses less digits than its factorization.

66552805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210067.

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 66552805 is about 8157.9902549586. The cubic root of 66552805 is about 405.2491582737.

The spelling of 66552805 in words is "sixty-six million, five hundred fifty-two thousand, eight hundred five".