661064120 has 32 divisors (see below), whose sum is σ = 1488654720. Its totient is φ = 264201600.

The previous prime is 661064029. The next prime is 661064161. The reversal of 661064120 is 21460166.

It is a happy number.

661064120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 661064120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45689 + ... + 58391.

It is an arithmetic number, because the mean of its divisors is an integer number (46520460).

Almost surely, 2^661064120 is an apocalyptic number.

It is an amenable number.

661064120 is an abundant number, since it is smaller than the sum of its proper divisors (827590600).

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

661064120 is a wasteful number, since it uses less digits than its factorization.

661064120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14015 (or 14011 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 661064120 is about 25711.1672236015. The cubic root of 661064120 is about 871.1264397890.

The spelling of 661064120 in words is "six hundred sixty-one million, sixty-four thousand, one hundred twenty".