6661562256 has 80 divisors (see below), whose sum is σ = 19147544320. Its totient is φ = 2217456000.

The previous prime is 6661562233. The next prime is 6661562263. The reversal of 6661562256 is 6522651666.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 314166 + ... + 334698.

It is an arithmetic number, because the mean of its divisors is an integer number (239344304).

Almost surely, 2^6661562256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6661562256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9573772160).

6661562256 is an abundant number, since it is smaller than the sum of its proper divisors (12485982064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6661562256 is a wasteful number, since it uses less digits than its factorization.

6661562256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21301 (or 21289 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 6661562256 is about 81618.3941032902. The cubic root of 6661562256 is about 1881.5915916820.

The spelling of 6661562256 in words is "six billion, six hundred sixty-one million, five hundred sixty-two thousand, two hundred fifty-six".