138618885075816 has 32 divisors (see below), whose sum is σ = 364786539674400. Its totient is φ = 43774384760640.

The previous prime is 138618885075691. The next prime is 138618885075817. The reversal of 138618885075816 is 618570588816831.

It is a Smith number, since the sum of its digits (75) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (138618885075817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151994391075 + ... + 151994391986.

It is an arithmetic number, because the mean of its divisors is an integer number (11399579364825).

Almost surely, 2^{138618885075816} is an apocalyptic number.

It is an amenable number.

138618885075816 is an abundant number, since it is smaller than the sum of its proper divisors (226167654598584).

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

138618885075816 is a wasteful number, since it uses less digits than its factorization.

138618885075816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303988783089 (or 303988783085 counting only the distinct ones).

The product of its (nonzero) digits is 619315200, while the sum is 75.

The spelling of 138618885075816 in words is "one hundred thirty-eight trillion, six hundred eighteen billion, eight hundred eighty-five million, seventy-five thousand, eight hundred sixteen".