661118384 has 10 divisors (see below), whose sum is σ = 1280916900. Its totient is φ = 330559184.

The previous prime is 661118377. The next prime is 661118387. The reversal of 661118384 is 483811166.

It is not an unprimeable number, because it can be changed into a prime (661118387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20659934 + ... + 20659965.

It is an arithmetic number, because the mean of its divisors is an integer number (128091690).

Almost surely, 2^661118384 is an apocalyptic number.

It is an amenable number.

661118384 is a deficient number, since it is larger than the sum of its proper divisors (619798516).

661118384 is a wasteful number, since it uses less digits than its factorization.

661118384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41319907 (or 41319901 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 661118384 is about 25712.2224632567. Note that the first 3 decimals coincide. The cubic root of 661118384 is about 871.1502748504.

The spelling of 661118384 in words is "six hundred sixty-one million, one hundred eighteen thousand, three hundred eighty-four".