6531877985 has 16 divisors (see below), whose sum is σ = 8184761856. Its totient is φ = 4994814528.

The previous prime is 6531877907. The next prime is 6531877997. The reversal of 6531877985 is 5897781356.

It is a cyclic number.

It is not a de Polignac number, because 6531877985 - 2¹² = 6531873889 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 151907 + ... + 190103.

It is an arithmetic number, because the mean of its divisors is an integer number (511547616).

Almost surely, 2^6531877985 is an apocalyptic number.

It is an amenable number.

6531877985 is a deficient number, since it is larger than the sum of its proper divisors (1652883871).

6531877985 is a wasteful number, since it uses less digits than its factorization.

6531877985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39712.

The product of its digits is 12700800, while the sum is 59.

The square root of 6531877985 is about 80820.0345520837. The cubic root of 6531877985 is about 1869.3015002060.

The spelling of 6531877985 in words is "six billion, five hundred thirty-one million, eight hundred seventy-seven thousand, nine hundred eighty-five".