168684157 has 2 divisors, whose sum is σ = 168684158. Its totient is φ = 168684156.

The previous prime is 168684121. The next prime is 168684163. The reversal of 168684157 is 751486861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168636196 + 47961 = 12986^2 + 219^2 .

It is a cyclic number.

It is not a de Polignac number, because 168684157 - 2⁷ = 168684029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168684757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84342078 + 84342079.

It is an arithmetic number, because the mean of its divisors is an integer number (84342079).

Almost surely, 2^168684157 is an apocalyptic number.

It is an amenable number.

168684157 is a deficient number, since it is larger than the sum of its proper divisors (1).

168684157 is an equidigital number, since it uses as much as digits as its factorization.

168684157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 46.

The square root of 168684157 is about 12987.8465112581. The cubic root of 168684157 is about 552.5328435394.

It can be divided in two parts, 16868 and 4157, that added together give a square (21025 = 145²).

The spelling of 168684157 in words is "one hundred sixty-eight million, six hundred eighty-four thousand, one hundred fifty-seven".