661322760 has 64 divisors (see below), whose sum is σ = 2267395200. Its totient is φ = 151159296.

The previous prime is 661322747. The next prime is 661322773. The reversal of 661322760 is 67223166.

661322760 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (661322747) and next prime (661322773).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 392805 + ... + 394484.

It is an arithmetic number, because the mean of its divisors is an integer number (35428050).

Almost surely, 2^661322760 is an apocalyptic number.

661322760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661322760 is an abundant number, since it is smaller than the sum of its proper divisors (1606072440).

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

661322760 is a wasteful number, since it uses less digits than its factorization.

661322760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787310 (or 787306 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 661322760 is about 25716.1964528194. The cubic root of 661322760 is about 871.2400337951.

The spelling of 661322760 in words is "six hundred sixty-one million, three hundred twenty-two thousand, seven hundred sixty".