661183712 has 48 divisors (see below), whose sum is σ = 1523968992. Its totient is φ = 276449280.

The previous prime is 661183711. The next prime is 661183799. The reversal of 661183712 is 217381166.

661183712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661183711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26813 + ... + 45180.

It is an arithmetic number, because the mean of its divisors is an integer number (31749354).

Almost surely, 2^661183712 is an apocalyptic number.

It is an amenable number.

661183712 is an abundant number, since it is smaller than the sum of its proper divisors (862785280).

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

661183712 is a wasteful number, since it uses less digits than its factorization.

661183712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72051 (or 72043 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 661183712 is about 25713.4928004735. The cubic root of 661183712 is about 871.1789679621.

The spelling of 661183712 in words is "six hundred sixty-one million, one hundred eighty-three thousand, seven hundred twelve".