8011881643 has 4 divisors (see below), whose sum is σ = 8012762920. Its totient is φ = 8011000368.

The previous prime is 8011881629. The next prime is 8011881667. The reversal of 8011881643 is 3461881108.

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 8011881643 - 2⁵ = 8011881611 is a prime.

It is a super-2 number, since 2×8011881643² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8011881596 and 8011881605.

It is not an unprimeable number, because it can be changed into a prime (8011881623) 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, 426858 + ... + 445231.

It is an arithmetic number, because the mean of its divisors is an integer number (2003190730).

Almost surely, 2^8011881643 is an apocalyptic number.

8011881643 is a deficient number, since it is larger than the sum of its proper divisors (881277).

8011881643 is an equidigital number, since it uses as much as digits as its factorization.

8011881643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881276.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 8011881643 is about 89509.1148598845. The cubic root of 8011881643 is about 2000.9896471352.

The spelling of 8011881643 in words is "eight billion, eleven million, eight hundred eighty-one thousand, six hundred forty-three".