66202138 has 4 divisors (see below), whose sum is σ = 99303210. Its totient is φ = 33101068.

The previous prime is 66202133. The next prime is 66202153. The reversal of 66202138 is 83120266.

66202138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83120266 = 2 ⋅41560133.

It can be written as a sum of positive squares in only one way, i.e., 63632529 + 2569609 = 7977^2 + 1603^2 .

It is a super-3 number, since 3×66202138³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66202133) 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, 16550533 + ... + 16550536.

Almost surely, 2^66202138 is an apocalyptic number.

66202138 is a deficient number, since it is larger than the sum of its proper divisors (33101072).

66202138 is a wasteful number, since it uses less digits than its factorization.

66202138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33101071.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 66202138 is about 8136.4696275473. The cubic root of 66202138 is about 404.5361513708.

The spelling of 66202138 in words is "sixty-six million, two hundred two thousand, one hundred thirty-eight".