138628953618 has 16 divisors (see below), whose sum is σ = 277272441120. Its totient is φ = 46207228896.

The previous prime is 138628953611. The next prime is 138628953641. The reversal of 138628953618 is 816359826831.

It is not an unprimeable number, because it can be changed into a prime (138628953611) 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, 479563 + ... + 712206.

It is an arithmetic number, because the mean of its divisors is an integer number (17329527570).

Almost surely, 2^138628953618 is an apocalyptic number.

138628953618 is an abundant number, since it is smaller than the sum of its proper divisors (138643487502).

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

138628953618 is a wasteful number, since it uses less digits than its factorization.

138628953618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211161.

The product of its digits is 14929920, while the sum is 60.

The spelling of 138628953618 in words is "one hundred thirty-eight billion, six hundred twenty-eight million, nine hundred fifty-three thousand, six hundred eighteen".