661730900 has 36 divisors (see below), whose sum is σ = 1437129372. Its totient is φ = 264476160.

The previous prime is 661730887. The next prime is 661730921. The reversal of 661730900 is 9037166.

661730900 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 50751376 + 610979524 = 7124^2 + 24718^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 185534 + ... + 189066.

Almost surely, 2^661730900 is an apocalyptic number.

It is an amenable number.

661730900 is an abundant number, since it is smaller than the sum of its proper divisors (775398472).

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

661730900 is a wasteful number, since it uses less digits than its factorization.

661730900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5420 (or 5413 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 661730900 is about 25724.1306947387. The cubic root of 661730900 is about 871.4192275780.

The spelling of 661730900 in words is "six hundred sixty-one million, seven hundred thirty thousand, nine hundred".