8642191881 has 8 divisors (see below), whose sum is σ = 11768091264. Its totient is φ = 5638876880.

The previous prime is 8642191867. The next prime is 8642191889. The reversal of 8642191881 is 1881912468.

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 8642191881 - 2²⁶ = 8575083017 is a prime.

It is a super-3 number, since 3×8642191881³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 8642191881.

It is not an unprimeable number, because it can be changed into a prime (8642191889) 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, 30645930 + ... + 30646211.

It is an arithmetic number, because the mean of its divisors is an integer number (1471011408).

Almost surely, 2^8642191881 is an apocalyptic number.

It is an amenable number.

8642191881 is a deficient number, since it is larger than the sum of its proper divisors (3125899383).

8642191881 is a wasteful number, since it uses less digits than its factorization.

8642191881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61292191.

The product of its digits is 221184, while the sum is 48.

The square root of 8642191881 is about 92963.3900038074. The cubic root of 8642191881 is about 2052.1446428122.

The spelling of 8642191881 in words is "eight billion, six hundred forty-two million, one hundred ninety-one thousand, eight hundred eighty-one".