5661156778 has 8 divisors (see below), whose sum is σ = 8492938272. Its totient is φ = 2830177356.

The previous prime is 5661156763. The next prime is 5661156803. The reversal of 5661156778 is 8776511665.

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

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, 182550 + ... + 211297.

It is an arithmetic number, because the mean of its divisors is an integer number (1061617284).

Almost surely, 2^5661156778 is an apocalyptic number.

5661156778 is a deficient number, since it is larger than the sum of its proper divisors (2831781494).

5661156778 is a wasteful number, since it uses less digits than its factorization.

5661156778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401036.

The product of its digits is 2116800, while the sum is 52.

The square root of 5661156778 is about 75240.6590747317. The cubic root of 5661156778 is about 1782.2490589868.

The spelling of 5661156778 in words is "five billion, six hundred sixty-one million, one hundred fifty-six thousand, seven hundred seventy-eight".