138409378533 has 16 divisors (see below), whose sum is σ = 217112751360. Its totient is φ = 86845099968.

The previous prime is 138409378507. The next prime is 138409378543. The reversal of 138409378533 is 335873904831.

138409378533 is a `hidden beast` number, since 1 + 38 + 4 + 0 + 9 + 3 + 78 + 533 = 666.

It is not a de Polignac number, because 138409378533 - 2⁶ = 138409378469 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 138409378533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138409378543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150772285 + ... + 150773202.

It is an arithmetic number, because the mean of its divisors is an integer number (13569546960).

Almost surely, 2^138409378533 is an apocalyptic number.

It is an amenable number.

138409378533 is a deficient number, since it is larger than the sum of its proper divisors (78703372827).

138409378533 is a wasteful number, since it uses less digits than its factorization.

138409378533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301545513 (or 301545507 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 138409378533 in words is "one hundred thirty-eight billion, four hundred nine million, three hundred seventy-eight thousand, five hundred thirty-three".