661220752 has 20 divisors (see below), whose sum is σ = 1283204080. Its totient is φ = 330071328.

The previous prime is 661220741. The next prime is 661220771. The reversal of 661220752 is 257022166.

661220752 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23478 + ... + 43285.

It is an arithmetic number, because the mean of its divisors is an integer number (64160204).

Almost surely, 2^661220752 is an apocalyptic number.

It is an amenable number.

661220752 is a deficient number, since it is larger than the sum of its proper divisors (621983328).

661220752 is a wasteful number, since it uses less digits than its factorization.

661220752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67390 (or 67384 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 661220752 is about 25714.2130348179. The cubic root of 661220752 is about 871.1952356881.

The spelling of 661220752 in words is "six hundred sixty-one million, two hundred twenty thousand, seven hundred fifty-two".