138776666 has 16 divisors (see below), whose sum is σ = 239331456. Its totient is φ = 59118576.

The previous prime is 138776657. The next prime is 138776681. The reversal of 138776666 is 666677831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27341 + ... + 32016.

It is an arithmetic number, because the mean of its divisors is an integer number (14958216).

Almost surely, 2^138776666 is an apocalyptic number.

138776666 is a deficient number, since it is larger than the sum of its proper divisors (100554790).

138776666 is a wasteful number, since it uses less digits than its factorization.

138776666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59533.

The product of its digits is 1524096, while the sum is 50.

The square root of 138776666 is about 11780.3508436718. The cubic root of 138776666 is about 517.7325656983.

The spelling of 138776666 in words is "one hundred thirty-eight million, seven hundred seventy-six thousand, six hundred sixty-six".