661100204 has 6 divisors (see below), whose sum is σ = 1156925364. Its totient is φ = 330550100.

The previous prime is 661100179. The next prime is 661100227. The reversal of 661100204 is 402001166.

It is a happy 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 as a sum of consecutive naturals, namely, 82637522 + ... + 82637529.

It is an arithmetic number, because the mean of its divisors is an integer number (192820894).

Almost surely, 2^661100204 is an apocalyptic number.

It is an amenable number.

661100204 is a deficient number, since it is larger than the sum of its proper divisors (495825160).

661100204 is a wasteful number, since it uses less digits than its factorization.

661100204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165275055 (or 165275053 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 661100204 is about 25711.8689324600. The cubic root of 661100204 is about 871.1422895649.

The spelling of 661100204 in words is "six hundred sixty-one million, one hundred thousand, two hundred four".