8191465645 has 16 divisors (see below), whose sum is σ = 10984921920. Its totient is φ = 5812124800.

The previous prime is 8191465619. The next prime is 8191465651. The reversal of 8191465645 is 5465641918.

It is a happy number.

It is not a de Polignac number, because 8191465645 - 2⁷ = 8191465517 is a prime.

It is a super-3 number, since 3×8191465645³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1814035 + ... + 1818544.

It is an arithmetic number, because the mean of its divisors is an integer number (686557620).

Almost surely, 2^8191465645 is an apocalyptic number.

It is an amenable number.

8191465645 is a deficient number, since it is larger than the sum of its proper divisors (2793456275).

8191465645 is a wasteful number, since it uses less digits than its factorization.

8191465645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3632636.

The product of its digits is 1036800, while the sum is 49.

The square root of 8191465645 is about 90506.7160215196. The cubic root of 8191465645 is about 2015.8298478167.

The spelling of 8191465645 in words is "eight billion, one hundred ninety-one million, four hundred sixty-five thousand, six hundred forty-five".