661444796 has 24 divisors (see below), whose sum is σ = 1232154000. Its totient is φ = 309792384.

The previous prime is 661444793. The next prime is 661444813. The reversal of 661444796 is 697444166.

It is a self number, because there is not a number n which added to its sum of digits gives 661444796.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661444793) 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 7 ways as a sum of consecutive naturals, for example, 42131 + ... + 55658.

It is an arithmetic number, because the mean of its divisors is an integer number (51339750).

Almost surely, 2^661444796 is an apocalyptic number.

It is an amenable number.

661444796 is a deficient number, since it is larger than the sum of its proper divisors (570709204).

661444796 is a wasteful number, since it uses less digits than its factorization.

661444796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97901 (or 97899 counting only the distinct ones).

The product of its digits is 870912, while the sum is 47.

The square root of 661444796 is about 25718.5690892787. The cubic root of 661444796 is about 871.2936214005.

The spelling of 661444796 in words is "six hundred sixty-one million, four hundred forty-four thousand, seven hundred ninety-six".