661187908 has 12 divisors (see below), whose sum is σ = 1166190592. Its totient is φ = 327990600.

The previous prime is 661187887. The next prime is 661187911. The reversal of 661187908 is 809781166.

661187908 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650268 + ... + 651283.

Almost surely, 2^661187908 is an apocalyptic number.

It is an amenable number.

661187908 is a deficient number, since it is larger than the sum of its proper divisors (505002684).

661187908 is a wasteful number, since it uses less digits than its factorization.

661187908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301682 (or 1301680 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 661187908 is about 25713.5743917488. The cubic root of 661187908 is about 871.1808108484.

The spelling of 661187908 in words is "six hundred sixty-one million, one hundred eighty-seven thousand, nine hundred eight".