257117066 has 4 divisors (see below), whose sum is σ = 385675602. Its totient is φ = 128558532.

The previous prime is 257117059. The next prime is 257117071. The reversal of 257117066 is 660711752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 145709041 + 111408025 = 12071^2 + 10555^2 .

It is a super-3 number, since 3×257117066³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64279265 + ... + 64279268.

Almost surely, 2^257117066 is an apocalyptic number.

257117066 is a deficient number, since it is larger than the sum of its proper divisors (128558536).

257117066 is a wasteful number, since it uses less digits than its factorization.

257117066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128558535.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 257117066 is about 16034.8703144117. The cubic root of 257117066 is about 635.8826389066.

The spelling of 257117066 in words is "two hundred fifty-seven million, one hundred seventeen thousand, sixty-six".