661128008 has 16 divisors (see below), whose sum is σ = 1293511680. Its totient is φ = 316191568.

The previous prime is 661128001. The next prime is 661128019. The reversal of 661128008 is 800821166.

It is not an unprimeable number, because it can be changed into a prime (661128001) by changing a digit.

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, 1796360 + ... + 1796727.

It is an arithmetic number, because the mean of its divisors is an integer number (80844480).

Almost surely, 2^661128008 is an apocalyptic number.

It is an amenable number.

661128008 is a deficient number, since it is larger than the sum of its proper divisors (632383672).

661128008 is a wasteful number, since it uses less digits than its factorization.

661128008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3593116 (or 3593112 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 661128008 is about 25712.4096109252. The cubic root of 661128008 is about 871.1545019852.

The spelling of 661128008 in words is "six hundred sixty-one million, one hundred twenty-eight thousand, eight".