138277566 has 24 divisors (see below), whose sum is σ = 342401904. Its totient is φ = 39507840.

The previous prime is 138277561. The next prime is 138277589. The reversal of 138277566 is 665772831.

138277566 is a `hidden beast` number, since 1 + 3 + 82 + 7 + 7 + 566 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138277561) 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 in 11 ways as a sum of consecutive naturals, for example, 548595 + ... + 548846.

It is an arithmetic number, because the mean of its divisors is an integer number (14266746).

Almost surely, 2^138277566 is an apocalyptic number.

138277566 is an abundant number, since it is smaller than the sum of its proper divisors (204124338).

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

138277566 is a wasteful number, since it uses less digits than its factorization.

138277566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097456 (or 1097453 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 138277566 is about 11759.1481834357. The cubic root of 138277566 is about 517.1111578782. Note that the first 4 decimals are identical.

The spelling of 138277566 in words is "one hundred thirty-eight million, two hundred seventy-seven thousand, five hundred sixty-six".