6538252181081 has 4 divisors (see below), whose sum is σ = 6538296391632. Its totient is φ = 6538207970532.

The previous prime is 6538252181063. The next prime is 6538252181089. The reversal of 6538252181081 is 1801812528356.

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 a cyclic number.

It is not a de Polignac number, because 6538252181081 - 2²⁶ = 6538185072217 is a prime.

It is a super-2 number, since 2×6538252181081² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6538252181089) 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, 21882695 + ... + 22179468.

It is an arithmetic number, because the mean of its divisors is an integer number (1634574097908).

Almost surely, 2^{6538252181081} is an apocalyptic number.

It is an amenable number.

6538252181081 is a deficient number, since it is larger than the sum of its proper divisors (44210551).

6538252181081 is a wasteful number, since it uses less digits than its factorization.

6538252181081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44210550.

The product of its (nonzero) digits is 921600, while the sum is 50.

The spelling of 6538252181081 in words is "six trillion, five hundred thirty-eight billion, two hundred fifty-two million, one hundred eighty-one thousand, eighty-one".