661355130 has 16 divisors (see below), whose sum is σ = 1587252384. Its totient is φ = 176361360.

The previous prime is 661355129. The next prime is 661355141. The reversal of 661355130 is 31553166.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 22045171 = 661355130 / (6 + 6 + 1 + 3 + 5 + 5 + 1 + 3 + 0).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11022556 + ... + 11022615.

It is an arithmetic number, because the mean of its divisors is an integer number (99203274).

Almost surely, 2^661355130 is an apocalyptic number.

661355130 is an abundant number, since it is smaller than the sum of its proper divisors (925897254).

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

661355130 is a wasteful number, since it uses less digits than its factorization.

661355130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22045181.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 661355130 is about 25716.8258150185. The cubic root of 661355130 is about 871.2542485283.

The spelling of 661355130 in words is "six hundred sixty-one million, three hundred fifty-five thousand, one hundred thirty".