661130300 has 18 divisors (see below), whose sum is σ = 1434652968. Its totient is φ = 264452080.

The previous prime is 661130293. The next prime is 661130303. The reversal of 661130300 is 3031166.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661130303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3305552 + ... + 3305751.

Almost surely, 2^661130300 is an apocalyptic number.

It is an amenable number.

661130300 is an abundant number, since it is smaller than the sum of its proper divisors (773522668).

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

661130300 is a wasteful number, since it uses less digits than its factorization.

661130300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6611317 (or 6611310 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 661130300 is about 25712.4541808051. The cubic root of 661130300 is about 871.1555086908.

Adding to 661130300 its reverse (3031166), we get a palindrome (664161466).

The spelling of 661130300 in words is "six hundred sixty-one million, one hundred thirty thousand, three hundred".