668170157 has 2 divisors, whose sum is σ = 668170158. Its totient is φ = 668170156.

The previous prime is 668170141. The next prime is 668170183. The reversal of 668170157 is 751071866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 562923076 + 105247081 = 23726^2 + 10259^2 .

It is a cyclic number.

It is not a de Polignac number, because 668170157 - 2⁴ = 668170141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668170117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334085078 + 334085079.

It is an arithmetic number, because the mean of its divisors is an integer number (334085079).

Almost surely, 2^668170157 is an apocalyptic number.

It is an amenable number.

668170157 is a deficient number, since it is larger than the sum of its proper divisors (1).

668170157 is an equidigital number, since it uses as much as digits as its factorization.

668170157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 668170157 is about 25848.9875430354. The cubic root of 668170157 is about 874.2366815675.

The spelling of 668170157 in words is "six hundred sixty-eight million, one hundred seventy thousand, one hundred fifty-seven".