661854684 has 48 divisors (see below), whose sum is σ = 1574294400. Its totient is φ = 216355776.

The previous prime is 661854671. The next prime is 661854703. The reversal of 661854684 is 486458166.

It is a congruent 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, 386422 + ... + 388130.

It is an arithmetic number, because the mean of its divisors is an integer number (32797800).

Almost surely, 2^661854684 is an apocalyptic number.

It is an amenable number.

661854684 is an abundant number, since it is smaller than the sum of its proper divisors (912439716).

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

661854684 is a wasteful number, since it uses less digits than its factorization.

661854684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322 (or 2320 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 48.

The square root of 661854684 is about 25726.5365721855. The cubic root of 661854684 is about 871.4735603551.

The spelling of 661854684 in words is "six hundred sixty-one million, eight hundred fifty-four thousand, six hundred eighty-four".