138044666 has 12 divisors (see below), whose sum is σ = 216463002. Its totient is φ = 66020856.

The previous prime is 138044629. The next prime is 138044693. The reversal of 138044666 is 666440831.

138044666 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., 134908225 + 3136441 = 11615^2 + 1771^2 .

It is a super-2 number, since 2×138044666² = 38112659622103112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64181 + ... + 66296.

Almost surely, 2^138044666 is an apocalyptic number.

138044666 is a deficient number, since it is larger than the sum of its proper divisors (78418336).

138044666 is a wasteful number, since it uses less digits than its factorization.

138044666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130525 (or 130502 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 138044666 is about 11749.2410818742. The cubic root of 138044666 is about 516.8206724159.

The spelling of 138044666 in words is "one hundred thirty-eight million, forty-four thousand, six hundred sixty-six".