8136816881 has 8 divisors (see below), whose sum is σ = 8500953024. Its totient is φ = 7773544240.

The previous prime is 8136816869. The next prime is 8136816887. The reversal of 8136816881 is 1886186318.

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

It is a cyclic number.

It is not a de Polignac number, because 8136816881 - 2⁶ = 8136816817 is a prime.

It is a super-2 number, since 2×8136816881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8136816887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196571 + ... + 234336.

It is an arithmetic number, because the mean of its divisors is an integer number (1062619128).

Almost surely, 2^8136816881 is an apocalyptic number.

It is an amenable number.

8136816881 is a deficient number, since it is larger than the sum of its proper divisors (364136143).

8136816881 is a wasteful number, since it uses less digits than its factorization.

8136816881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431751.

The product of its digits is 442368, while the sum is 50.

The square root of 8136816881 is about 90204.3063329019. The cubic root of 8136816881 is about 2011.3370212970.

The spelling of 8136816881 in words is "eight billion, one hundred thirty-six million, eight hundred sixteen thousand, eight hundred eighty-one".