8641965813 has 8 divisors (see below), whose sum is σ = 12408976608. Its totient is φ = 5318132784.

The previous prime is 8641965799. The next prime is 8641965817. The reversal of 8641965813 is 3185691468.

8641965813 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 8641965813 - 2¹² = 8641961717 is a prime.

It is a super-2 number, since 2×8641965813² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8641965817) 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, 110794395 + ... + 110794472.

It is an arithmetic number, because the mean of its divisors is an integer number (1551122076).

Almost surely, 2^8641965813 is an apocalyptic number.

It is an amenable number.

8641965813 is a deficient number, since it is larger than the sum of its proper divisors (3767010795).

8641965813 is a wasteful number, since it uses less digits than its factorization.

8641965813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221588883.

The product of its digits is 1244160, while the sum is 51.

The square root of 8641965813 is about 92962.1740978555. The cubic root of 8641965813 is about 2052.1267488841.

The spelling of 8641965813 in words is "eight billion, six hundred forty-one million, nine hundred sixty-five thousand, eight hundred thirteen".