6561455 has 8 divisors (see below), whose sum is σ = 7936512. Its totient is φ = 5207328.

The previous prime is 6561437. The next prime is 6561461. The reversal of 6561455 is 5541656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6561455 - 2⁸ = 6561199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4532 + ... + 5801.

It is an arithmetic number, because the mean of its divisors is an integer number (992064).

Almost surely, 2^6561455 is an apocalyptic number.

6561455 is a deficient number, since it is larger than the sum of its proper divisors (1375057).

6561455 is a wasteful number, since it uses less digits than its factorization.

6561455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10465.

The product of its digits is 18000, while the sum is 32.

The square root of 6561455 is about 2561.5337202543. The cubic root of 6561455 is about 187.2118715381.

The spelling of 6561455 in words is "six million, five hundred sixty-one thousand, four hundred fifty-five".