6461918217 has 6 divisors (see below), whose sum is σ = 9333881882. Its totient is φ = 4307945472.

The previous prime is 6461918209. The next prime is 6461918231. The reversal of 6461918217 is 7128191646.

6461918217 is a `hidden beast` number, since 6 + 4 + 619 + 1 + 8 + 21 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4867992441 + 1593925776 = 69771^2 + 39924^2 .

It is not a de Polignac number, because 6461918217 - 2³ = 6461918209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6461918237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 358995448 + ... + 358995465.

Almost surely, 2^6461918217 is an apocalyptic number.

It is an amenable number.

6461918217 is a deficient number, since it is larger than the sum of its proper divisors (2871963665).

6461918217 is a wasteful number, since it uses less digits than its factorization.

6461918217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717990919 (or 717990916 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 6461918217 is about 80386.0573544940. The cubic root of 6461918217 is about 1862.6038046854.

The spelling of 6461918217 in words is "six billion, four hundred sixty-one million, nine hundred eighteen thousand, two hundred seventeen".