138499344025 has 81 divisors (see below), whose sum is σ = 207034175583. Its totient is φ = 91907398800.

The previous prime is 138499344019. The next prime is 138499344043. The reversal of 138499344025 is 520443994831.

The square root of 138499344025 is 372155.

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

It can be written as a sum of positive squares in only one way, i.e., 49859763849 + 88639580176 = 223293^2 + 297724^2 .

It is not a de Polignac number, because 138499344025 - 2³ = 138499344017 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 4467720760 + ... + 4467720790.

Almost surely, 2^138499344025 is an apocalyptic number.

138499344025 is the 372155-th square number.

138499344025 is the 186078-th centered octagonal number.

It is an amenable number.

138499344025 is a deficient number, since it is larger than the sum of its proper divisors (68534831558).

138499344025 is an frugal number, since it uses more digits than its factorization.

138499344025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 52.

The spelling of 138499344025 in words is "one hundred thirty-eight billion, four hundred ninety-nine million, three hundred forty-four thousand, twenty-five".