66398356 has 6 divisors (see below), whose sum is σ = 116197130. Its totient is φ = 33199176.

The previous prime is 66398351. The next prime is 66398363. The reversal of 66398356 is 65389366.

66398356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 50637456 + 15760900 = 7116^2 + 3970^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66398351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8299791 + ... + 8299798.

Almost surely, 2^66398356 is an apocalyptic number.

It is an amenable number.

66398356 is a deficient number, since it is larger than the sum of its proper divisors (49798774).

66398356 is a wasteful number, since it uses less digits than its factorization.

66398356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16599593 (or 16599591 counting only the distinct ones).

The product of its digits is 699840, while the sum is 46.

The square root of 66398356 is about 8148.5186383784. The cubic root of 66398356 is about 404.9354284090.

The spelling of 66398356 in words is "sixty-six million, three hundred ninety-eight thousand, three hundred fifty-six".