661648324 has 36 divisors (see below), whose sum is σ = 1249519600. Its totient is φ = 305709120.

The previous prime is 661648321. The next prime is 661648333. The reversal of 661648324 is 423846166.

It is not an unprimeable number, because it can be changed into a prime (661648321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125167 + ... + 130345.

Almost surely, 2^661648324 is an apocalyptic number.

It is an amenable number.

661648324 is a deficient number, since it is larger than the sum of its proper divisors (587871276).

661648324 is a wasteful number, since it uses less digits than its factorization.

661648324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5284 (or 5241 counting only the distinct ones).

The product of its digits is 165888, while the sum is 40.

The square root of 661648324 is about 25722.5256147214. The cubic root of 661648324 is about 871.3829785491.

The spelling of 661648324 in words is "six hundred sixty-one million, six hundred forty-eight thousand, three hundred twenty-four".