1238506365563 has 4 divisors (see below), whose sum is σ = 1250768804928. Its totient is φ = 1226243926200.

The previous prime is 1238506365521. The next prime is 1238506365587. The reversal of 1238506365563 is 3655636058321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1238506365563 - 2²⁰ = 1238505316987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1238506355563) 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, 6131219531 + ... + 6131219732.

It is an arithmetic number, because the mean of its divisors is an integer number (312692201232).

Almost surely, 2^{1238506365563} is an apocalyptic number.

1238506365563 is a deficient number, since it is larger than the sum of its proper divisors (12262439365).

1238506365563 is a wasteful number, since it uses less digits than its factorization.

1238506365563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12262439364.

The product of its (nonzero) digits is 11664000, while the sum is 53.

The spelling of 1238506365563 in words is "one trillion, two hundred thirty-eight billion, five hundred six million, three hundred sixty-five thousand, five hundred sixty-three".