257120168 has 8 divisors (see below), whose sum is σ = 482100330. Its totient is φ = 128560080.

The previous prime is 257120167. The next prime is 257120173. The reversal of 257120168 is 861021752.

It can be written as a sum of positive squares in only one way, i.e., 187197124 + 69923044 = 13682^2 + 8362^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×257120168² = 132221561584696448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257120161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16070003 + ... + 16070018.

Almost surely, 2^257120168 is an apocalyptic number.

It is an amenable number.

257120168 is a deficient number, since it is larger than the sum of its proper divisors (224980162).

257120168 is a wasteful number, since it uses less digits than its factorization.

257120168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32140027 (or 32140023 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 257120168 is about 16034.9670408143. The cubic root of 257120168 is about 635.8851961076.

The spelling of 257120168 in words is "two hundred fifty-seven million, one hundred twenty thousand, one hundred sixty-eight".