661832442 has 48 divisors (see below), whose sum is σ = 1447686240. Its totient is φ = 218513376.

The previous prime is 661832419. The next prime is 661832443. The reversal of 661832442 is 244238166.

661832442 is a `hidden beast` number, since 6 + 618 + 32 + 4 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 661832397 and 661832406.

It is not an unprimeable number, because it can be changed into a prime (661832443) 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 23 ways as a sum of consecutive naturals, for example, 1265193 + ... + 1265715.

It is an arithmetic number, because the mean of its divisors is an integer number (30160130).

Almost surely, 2^661832442 is an apocalyptic number.

661832442 is an abundant number, since it is smaller than the sum of its proper divisors (785853798).

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

661832442 is a wasteful number, since it uses less digits than its factorization.

661832442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067 (or 1064 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 661832442 is about 25726.1042911670. The cubic root of 661832442 is about 871.4637981255.

It can be divided in two parts, 6618 and 32442, that added together give a triangular number (39060 = T₂₇₉).

The spelling of 661832442 in words is "six hundred sixty-one million, eight hundred thirty-two thousand, four hundred forty-two".