138568566 has 32 divisors (see below), whose sum is σ = 281304576. Its totient is φ = 45500000.

The previous prime is 138568541. The next prime is 138568571. The reversal of 138568566 is 665865831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151651 + ... + 152561.

It is an arithmetic number, because the mean of its divisors is an integer number (8790768).

Almost surely, 2^138568566 is an apocalyptic number.

138568566 is an abundant number, since it is smaller than the sum of its proper divisors (142736010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138568566 is a wasteful number, since it uses less digits than its factorization.

138568566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268.

The product of its digits is 1036800, while the sum is 48.

The square root of 138568566 is about 11771.5150256881. The cubic root of 138568566 is about 517.4736507857.

It can be divided in two parts, 13856 and 8566, that added together give a palindrome (22422).

The spelling of 138568566 in words is "one hundred thirty-eight million, five hundred sixty-eight thousand, five hundred sixty-six".