168561513604 has 48 divisors (see below), whose sum is σ = 322633684800. Its totient is φ = 76420431360.

The previous prime is 168561513583. The next prime is 168561513607. The reversal of 168561513604 is 406315165861.

It is not an unprimeable number, because it can be changed into a prime (168561513607) 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 15 ways as a sum of consecutive naturals, for example, 55282672 + ... + 55285720.

It is an arithmetic number, because the mean of its divisors is an integer number (6721535100).

Almost surely, 2^168561513604 is an apocalyptic number.

It is an amenable number.

168561513604 is a deficient number, since it is larger than the sum of its proper divisors (154072171196).

168561513604 is a wasteful number, since it uses less digits than its factorization.

168561513604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5908 (or 5906 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 168561513604 in words is "one hundred sixty-eight billion, five hundred sixty-one million, five hundred thirteen thousand, six hundred four".