6464495561 has 4 divisors (see below), whose sum is σ = 6466063812. Its totient is φ = 6462927312.

The previous prime is 6464495551. The next prime is 6464495617. The reversal of 6464495561 is 1655944646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2374125625 + 4090369936 = 48725^2 + 63956^2 .

It is a cyclic number.

It is not a de Polignac number, because 6464495561 - 2¹⁰ = 6464494537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6464495501) 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, 777926 + ... + 786191.

It is an arithmetic number, because the mean of its divisors is an integer number (1616515953).

Almost surely, 2^6464495561 is an apocalyptic number.

It is an amenable number.

6464495561 is a deficient number, since it is larger than the sum of its proper divisors (1568251).

6464495561 is a wasteful number, since it uses less digits than its factorization.

6464495561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568250.

The product of its digits is 3110400, while the sum is 50.

The square root of 6464495561 is about 80402.0867950578. The cubic root of 6464495561 is about 1862.8514057064.

The spelling of 6464495561 in words is "six billion, four hundred sixty-four million, four hundred ninety-five thousand, five hundred sixty-one".