168516668500 has 48 divisors (see below), whose sum is σ = 368747385552. Its totient is φ = 67277184000.

The previous prime is 168516668491. The next prime is 168516668503. The reversal of 168516668500 is 5866615861.

It can be written as a sum of positive squares in 8 ways, for example, as 88307631556 + 80209036944 = 297166^2 + 283212^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168516668503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62949 + ... + 583948.

It is an arithmetic number, because the mean of its divisors is an integer number (7682237199).

Almost surely, 2^168516668500 is an apocalyptic number.

168516668500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168516668500 is an abundant number, since it is smaller than the sum of its proper divisors (200230717052).

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

168516668500 is a wasteful number, since it uses less digits than its factorization.

168516668500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647437 (or 647425 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 168516668500 in words is "one hundred sixty-eight billion, five hundred sixteen million, six hundred sixty-eight thousand, five hundred".