138015520145 has 4 divisors (see below), whose sum is σ = 165618624180. Its totient is φ = 110412416112.

The previous prime is 138015520121. The next prime is 138015520151. The reversal of 138015520145 is 541025510831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79210725136 + 58804795009 = 281444^2 + 242497^2 .

It is a cyclic number.

It is not a de Polignac number, because 138015520145 - 2¹⁸ = 138015258001 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13801552010 + ... + 13801552019.

It is an arithmetic number, because the mean of its divisors is an integer number (41404656045).

Almost surely, 2^138015520145 is an apocalyptic number.

It is an amenable number.

138015520145 is a deficient number, since it is larger than the sum of its proper divisors (27603104035).

138015520145 is an equidigital number, since it uses as much as digits as its factorization.

138015520145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27603104034.

The product of its (nonzero) digits is 24000, while the sum is 35.

The spelling of 138015520145 in words is "one hundred thirty-eight billion, fifteen million, five hundred twenty thousand, one hundred forty-five".