6465561 has 4 divisors (see below), whose sum is σ = 8620752. Its totient is φ = 4310372.

The previous prime is 6465551. The next prime is 6465581. The reversal of 6465561 is 1655646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6465561 - 2⁶ = 6465497 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (6465551) 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, 1077591 + ... + 1077596.

It is an arithmetic number, because the mean of its divisors is an integer number (2155188).

Almost surely, 2^6465561 is an apocalyptic number.

It is an amenable number.

6465561 is a deficient number, since it is larger than the sum of its proper divisors (2155191).

6465561 is a wasteful number, since it uses less digits than its factorization.

6465561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155190.

The product of its digits is 21600, while the sum is 33.

The square root of 6465561 is about 2542.7467431893. The cubic root of 6465561 is about 186.2953741379.

The spelling of 6465561 in words is "six million, four hundred sixty-five thousand, five hundred sixty-one".