660961964 has 12 divisors (see below), whose sum is σ = 1245659184. Its totient is φ = 305059344.

The previous prime is 660961963. The next prime is 660961967. The reversal of 660961964 is 469169066.

It is not an unprimeable number, because it can be changed into a prime (660961963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6355352 + ... + 6355455.

It is an arithmetic number, because the mean of its divisors is an integer number (103804932).

Almost surely, 2^660961964 is an apocalyptic number.

It is an amenable number.

660961964 is a deficient number, since it is larger than the sum of its proper divisors (584697220).

660961964 is a wasteful number, since it uses less digits than its factorization.

660961964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12710824 (or 12710822 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 660961964 is about 25709.1805392548. The cubic root of 660961964 is about 871.0815649807.

The spelling of 660961964 in words is "six hundred sixty million, nine hundred sixty-one thousand, nine hundred sixty-four".