661044884 has 24 divisors (see below), whose sum is σ = 1223110560. Its totient is φ = 311738976.

The previous prime is 661044869. The next prime is 661044887. The reversal of 661044884 is 488440166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661044887) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1907 + ... + 36410.

It is an arithmetic number, because the mean of its divisors is an integer number (50962940).

Almost surely, 2^661044884 is an apocalyptic number.

It is an amenable number.

661044884 is a deficient number, since it is larger than the sum of its proper divisors (562065676).

661044884 is a wasteful number, since it uses less digits than its factorization.

661044884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38567 (or 38565 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 41.

The square root of 661044884 is about 25710.7931421806. The cubic root of 661044884 is about 871.1179902048.

The spelling of 661044884 in words is "six hundred sixty-one million, forty-four thousand, eight hundred eighty-four".