6464565161 has 4 divisors (see below), whose sum is σ = 6622237524. Its totient is φ = 6306892800.

The previous prime is 6464565139. The next prime is 6464565203. The reversal of 6464565161 is 1615654646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1615654646 = 2 ⋅807827323.

It can be written as a sum of positive squares in 2 ways, for example, as 232410025 + 6232155136 = 15245^2 + 78944^2 .

It is a cyclic number.

It is not a de Polignac number, because 6464565161 - 2²⁶ = 6397456297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6464568161) 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, 78836120 + ... + 78836201.

It is an arithmetic number, because the mean of its divisors is an integer number (1655559381).

Almost surely, 2^6464565161 is an apocalyptic number.

It is an amenable number.

6464565161 is a deficient number, since it is larger than the sum of its proper divisors (157672363).

6464565161 is a wasteful number, since it uses less digits than its factorization.

6464565161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157672362.

The product of its digits is 518400, while the sum is 44.

The square root of 6464565161 is about 80402.5196184796. The cubic root of 6464565161 is about 1862.8580911465.

The spelling of 6464565161 in words is "six billion, four hundred sixty-four million, five hundred sixty-five thousand, one hundred sixty-one".