66522805 has 4 divisors (see below), whose sum is σ = 79827372. Its totient is φ = 53218240.

The previous prime is 66522803. The next prime is 66522821. The reversal of 66522805 is 50822566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50822566 = 2 ⋅25411283.

It can be written as a sum of positive squares in 2 ways, for example, as 11303044 + 55219761 = 3362^2 + 7431^2 .

It is not a de Polignac number, because 66522805 - 2¹ = 66522803 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 (66522803) 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 3 ways as a sum of consecutive naturals, for example, 6652276 + ... + 6652285.

It is an arithmetic number, because the mean of its divisors is an integer number (19956843).

Almost surely, 2^66522805 is an apocalyptic number.

It is an amenable number.

66522805 is a deficient number, since it is larger than the sum of its proper divisors (13304567).

66522805 is a wasteful number, since it uses less digits than its factorization.

66522805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13304566.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 66522805 is about 8156.1513595568. The cubic root of 66522805 is about 405.1882577504.

The spelling of 66522805 in words is "sixty-six million, five hundred twenty-two thousand, eight hundred five".