6537581966 has 8 divisors (see below), whose sum is σ = 9972582840. Its totient is φ = 3213387688.

The previous prime is 6537581951. The next prime is 6537581989. The reversal of 6537581966 is 6691857356.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27701501 + ... + 27701736.

It is an arithmetic number, because the mean of its divisors is an integer number (1246572855).

Almost surely, 2^6537581966 is an apocalyptic number.

6537581966 is a deficient number, since it is larger than the sum of its proper divisors (3435000874).

6537581966 is a wasteful number, since it uses less digits than its factorization.

6537581966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55403298.

The product of its digits is 8164800, while the sum is 56.

The square root of 6537581966 is about 80855.3150139185. The cubic root of 6537581966 is about 1869.8454661779.

The spelling of 6537581966 in words is "six billion, five hundred thirty-seven million, five hundred eighty-one thousand, nine hundred sixty-six".