538206118551663 has 4 divisors (see below), whose sum is σ = 717608158068888. Its totient is φ = 358804079034440.

The previous prime is 538206118551649. The next prime is 538206118551667. The reversal of 538206118551663 is 366155811602835.

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 538206118551663 - 2²¹ = 538206116454511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 538206118551597 and 538206118551606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538206118551667) 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, 89701019758608 + ... + 89701019758613.

It is an arithmetic number, because the mean of its divisors is an integer number (179402039517222).

Almost surely, 2^{538206118551663} is an apocalyptic number.

538206118551663 is a deficient number, since it is larger than the sum of its proper divisors (179402039517225).

538206118551663 is a wasteful number, since it uses less digits than its factorization.

538206118551663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179402039517224.

The product of its (nonzero) digits is 31104000, while the sum is 60.

The spelling of 538206118551663 in words is "five hundred thirty-eight trillion, two hundred six billion, one hundred eighteen million, five hundred fifty-one thousand, six hundred sixty-three".