661048684 has 12 divisors (see below), whose sum is σ = 1217721400. Its totient is φ = 313128288.

The previous prime is 661048673. The next prime is 661048691. The reversal of 661048684 is 486840166.

It is a self number, because there is not a number n which added to its sum of digits gives 661048684.

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 3 ways as a sum of consecutive naturals, for example, 4348929 + ... + 4349080.

Almost surely, 2^661048684 is an apocalyptic number.

It is an amenable number.

661048684 is a deficient number, since it is larger than the sum of its proper divisors (556672716).

661048684 is a wasteful number, since it uses less digits than its factorization.

661048684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8698032 (or 8698030 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 661048684 is about 25710.8670410004. The cubic root of 661048684 is about 871.1196594016.

The spelling of 661048684 in words is "six hundred sixty-one million, forty-eight thousand, six hundred eighty-four".