168172916 has 6 divisors (see below), whose sum is σ = 294302610. Its totient is φ = 84086456.

The previous prime is 168172897. The next prime is 168172981. The reversal of 168172916 is 619271861.

It can be written as a sum of positive squares in only one way, i.e., 167443600 + 729316 = 12940^2 + 854^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21021611 + ... + 21021618.

It is an arithmetic number, because the mean of its divisors is an integer number (49050435).

Almost surely, 2^168172916 is an apocalyptic number.

It is an amenable number.

168172916 is a deficient number, since it is larger than the sum of its proper divisors (126129694).

168172916 is a wasteful number, since it uses less digits than its factorization.

168172916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42043233 (or 42043231 counting only the distinct ones).

The product of its digits is 36288, while the sum is 41.

The square root of 168172916 is about 12968.1500608221. The cubic root of 168172916 is about 551.9740807335.

The spelling of 168172916 in words is "one hundred sixty-eight million, one hundred seventy-two thousand, nine hundred sixteen".