1538880233717 has 4 divisors (see below), whose sum is σ = 1576413897996. Its totient is φ = 1501346569440.

The previous prime is 1538880233689. The next prime is 1538880233741. The reversal of 1538880233717 is 7173320888351.

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 57910497316 + 1480969736401 = 240646^2 + 1216951^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538880233717 - 2²² = 1538876039413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538880233797) 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, 18766832078 + ... + 18766832159.

It is an arithmetic number, because the mean of its divisors is an integer number (394103474499).

Almost surely, 2^{1538880233717} is an apocalyptic number.

It is an amenable number.

1538880233717 is a deficient number, since it is larger than the sum of its proper divisors (37533664279).

1538880233717 is an equidigital number, since it uses as much as digits as its factorization.

1538880233717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37533664278.

The product of its (nonzero) digits is 6773760, while the sum is 56.

The spelling of 1538880233717 in words is "one trillion, five hundred thirty-eight billion, eight hundred eighty million, two hundred thirty-three thousand, seven hundred seventeen".