6509481566 has 12 divisors (see below), whose sum is σ = 11159628792. Its totient is φ = 2789648436.

The previous prime is 6509481557. The next prime is 6509481619. The reversal of 6509481566 is 6651849056.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 291101 + ... + 312663.

It is an arithmetic number, because the mean of its divisors is an integer number (929969066).

Almost surely, 2^6509481566 is an apocalyptic number.

6509481566 is a deficient number, since it is larger than the sum of its proper divisors (4650147226).

6509481566 is an frugal number, since it uses more digits than its factorization.

6509481566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43135 (or 21572 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 50.

The square root of 6509481566 is about 80681.3582310065. The cubic root of 6509481566 is about 1867.1625747409.

The spelling of 6509481566 in words is "six billion, five hundred nine million, four hundred eighty-one thousand, five hundred sixty-six".