138209440633 has 4 divisors (see below), whose sum is σ = 150773935248. Its totient is φ = 125644946020.

The previous prime is 138209440627. The next prime is 138209440669. The reversal of 138209440633 is 336044902831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 138209440633 - 2²⁵ = 138175886201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138209440633.

It is not an unprimeable number, because it can be changed into a prime (138209440613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6282247291 + ... + 6282247312.

It is an arithmetic number, because the mean of its divisors is an integer number (37693483812).

Almost surely, 2^138209440633 is an apocalyptic number.

It is an amenable number.

138209440633 is a deficient number, since it is larger than the sum of its proper divisors (12564494615).

138209440633 is a wasteful number, since it uses less digits than its factorization.

138209440633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12564494614.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 138209440633 in words is "one hundred thirty-eight billion, two hundred nine million, four hundred forty thousand, six hundred thirty-three".