6561342663 has 8 divisors (see below), whose sum is σ = 8771912688. Its totient is φ = 4362500544.

The previous prime is 6561342631. The next prime is 6561342679. The reversal of 6561342663 is 3662431656.

It is a happy number.

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

It is not a de Polignac number, because 6561342663 - 2⁵ = 6561342631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561346663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2930670 + ... + 2932907.

It is an arithmetic number, because the mean of its divisors is an integer number (1096489086).

Almost surely, 2^6561342663 is an apocalyptic number.

6561342663 is a deficient number, since it is larger than the sum of its proper divisors (2210570025).

6561342663 is a wasteful number, since it uses less digits than its factorization.

6561342663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5863953.

The product of its digits is 466560, while the sum is 42.

The square root of 6561342663 is about 81002.1151760866. The cubic root of 6561342663 is about 1872.1080312979.

The spelling of 6561342663 in words is "six billion, five hundred sixty-one million, three hundred forty-two thousand, six hundred sixty-three".