138694924565 has 8 divisors (see below), whose sum is σ = 166653773880. Its totient is φ = 110809363392.

The previous prime is 138694924559. The next prime is 138694924573. The reversal of 138694924565 is 565429496831.

It can be written as a sum of positive squares in 4 ways, for example, as 28572493156 + 110122431409 = 169034^2 + 331847^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138694924565 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138694924498 and 138694924507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18317870 + ... + 18325439.

It is an arithmetic number, because the mean of its divisors is an integer number (20831721735).

Almost surely, 2^138694924565 is an apocalyptic number.

It is an amenable number.

138694924565 is a deficient number, since it is larger than the sum of its proper divisors (27958849315).

138694924565 is an equidigital number, since it uses as much as digits as its factorization.

138694924565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36644071.

The product of its digits is 55987200, while the sum is 62.

The spelling of 138694924565 in words is "one hundred thirty-eight billion, six hundred ninety-four million, nine hundred twenty-four thousand, five hundred sixty-five".