6511661546 has 8 divisors (see below), whose sum is σ = 10518837924. Its totient is φ = 3005382240.

The previous prime is 6511661341. The next prime is 6511661573. The reversal of 6511661546 is 6451661156.

It can be written as a sum of positive squares in 2 ways, for example, as 6177174025 + 334487521 = 78595^2 + 18289^2 .

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

It is a super-2 number, since 2×6511661546² = 84803472179310220232, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125224235 + ... + 125224286.

Almost surely, 2^6511661546 is an apocalyptic number.

6511661546 is a deficient number, since it is larger than the sum of its proper divisors (4007176378).

6511661546 is a wasteful number, since it uses less digits than its factorization.

6511661546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250448536.

The product of its digits is 129600, while the sum is 41.

The square root of 6511661546 is about 80694.8669123384. The cubic root of 6511661546 is about 1867.3709847212.

The spelling of 6511661546 in words is "six billion, five hundred eleven million, six hundred sixty-one thousand, five hundred forty-six".