6561484671 has 16 divisors (see below), whose sum is σ = 10000826624. Its totient is φ = 3748529664.

The previous prime is 6561484621. The next prime is 6561484687. The reversal of 6561484671 is 1764841656.

It is a happy number.

It is not a de Polignac number, because 6561484671 - 2⁶ = 6561484607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6561484671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561484621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59295 + ... + 128991.

It is an arithmetic number, because the mean of its divisors is an integer number (625051664).

Almost surely, 2^6561484671 is an apocalyptic number.

6561484671 is a deficient number, since it is larger than the sum of its proper divisors (3439341953).

6561484671 is a wasteful number, since it uses less digits than its factorization.

6561484671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74190.

The product of its digits is 967680, while the sum is 48.

The square root of 6561484671 is about 81002.9917410462. The cubic root of 6561484671 is about 1872.1215372937.

The spelling of 6561484671 in words is "six billion, five hundred sixty-one million, four hundred eighty-four thousand, six hundred seventy-one".