661329016 has 16 divisors (see below), whose sum is σ = 1270236240. Its totient is φ = 322599360.

The previous prime is 661328989. The next prime is 661329049. The reversal of 661329016 is 610923166.

661329016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1007796 + ... + 1008451.

It is an arithmetic number, because the mean of its divisors is an integer number (79389765).

Almost surely, 2^661329016 is an apocalyptic number.

It is an amenable number.

661329016 is a deficient number, since it is larger than the sum of its proper divisors (608907224).

661329016 is a wasteful number, since it uses less digits than its factorization.

661329016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016294 (or 2016290 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 661329016 is about 25716.3180879379. The cubic root of 661329016 is about 871.2427810469.

The spelling of 661329016 in words is "six hundred sixty-one million, three hundred twenty-nine thousand, sixteen".