661674760 has 32 divisors (see below), whose sum is σ = 1489671000. Its totient is φ = 264509440.

The previous prime is 661674749. The next prime is 661674763. The reversal of 661674760 is 67476166.

It can be written as a sum of positive squares in 4 ways, for example, as 489382884 + 172291876 = 22122^2 + 13126^2 .

It is not an unprimeable number, because it can be changed into a prime (661674763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79266 + ... + 87214.

Almost surely, 2^661674760 is an apocalyptic number.

It is an amenable number.

661674760 is an abundant number, since it is smaller than the sum of its proper divisors (827996240).

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

661674760 is a wasteful number, since it uses less digits than its factorization.

661674760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10041 (or 10037 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 661674760 is about 25723.0394782576. The cubic root of 661674760 is about 871.3945836938.

The spelling of 661674760 in words is "six hundred sixty-one million, six hundred seventy-four thousand, seven hundred sixty".