138618457565956 has 27 divisors (see below), whose sum is σ = 242786079078151. Its totient is φ = 69251055257384.

The previous prime is 138618457565873. The next prime is 138618457565969. The reversal of 138618457565956 is 659565754816831.

The square root of 138618457565956 is 11773634.

It is a perfect power (a square), and thus also a powerful number.

138618457565956 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 47165176335 + ... + 47165179273.

Almost surely, 2^{138618457565956} is an apocalyptic number.

138618457565956 is the 11773634-th square number.

It is an amenable number.

138618457565956 is a deficient number, since it is larger than the sum of its proper divisors (104167621512195).

138618457565956 is an frugal number, since it uses more digits than its factorization.

138618457565956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9888 (or 4944 counting only the distinct ones).

The product of its digits is 6531840000, while the sum is 79.

The spelling of 138618457565956 in words is "one hundred thirty-eight trillion, six hundred eighteen billion, four hundred fifty-seven million, five hundred sixty-five thousand, nine hundred fifty-six".