66123388 has 6 divisors (see below), whose sum is σ = 115715936. Its totient is φ = 33061692.

The previous prime is 66123377. The next prime is 66123389. The reversal of 66123388 is 88332166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66123389) 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, 8265420 + ... + 8265427.

Almost surely, 2^66123388 is an apocalyptic number.

It is an amenable number.

66123388 is a deficient number, since it is larger than the sum of its proper divisors (49592548).

66123388 is a wasteful number, since it uses less digits than its factorization.

66123388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16530851 (or 16530849 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 66123388 is about 8131.6288651168. The cubic root of 66123388 is about 404.3756839346.

It can be divided in two parts, 6612 and 3388, that added together give a 4-th power (10000 = 10⁴).

The spelling of 66123388 in words is "sixty-six million, one hundred twenty-three thousand, three hundred eighty-eight".