66038138 has 4 divisors (see below), whose sum is σ = 99057210. Its totient is φ = 33019068.

The previous prime is 66038131. The next prime is 66038197. The reversal of 66038138 is 83183066.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65011969 + 1026169 = 8063^2 + 1013^2 .

It is a super-2 number, since 2×66038138² = 8722071341014088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66038098 and 66038107.

It is not an unprimeable number, because it can be changed into a prime (66038131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16509533 + ... + 16509536.

Almost surely, 2^66038138 is an apocalyptic number.

66038138 is a deficient number, since it is larger than the sum of its proper divisors (33019072).

66038138 is a wasteful number, since it uses less digits than its factorization.

66038138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33019071.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 66038138 is about 8126.3852972893. The cubic root of 66038138 is about 404.2018278877.

It can be divided in two parts, 6603 and 8138, that added together give a palindrome (14741).

The spelling of 66038138 in words is "sixty-six million, thirty-eight thousand, one hundred thirty-eight".