257166745 has 24 divisors (see below), whose sum is σ = 341978112. Its totient is φ = 185502240.

The previous prime is 257166743. The next prime is 257166797. The reversal of 257166745 is 547661752.

257166745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 257166745 - 2¹ = 257166743 is a prime.

It is a super-2 number, since 2×257166745² = 132269469467790050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257166743) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75162 + ... + 78508.

It is an arithmetic number, because the mean of its divisors is an integer number (14249088).

Almost surely, 2^257166745 is an apocalyptic number.

It is an amenable number.

257166745 is a deficient number, since it is larger than the sum of its proper divisors (84811367).

257166745 is a wasteful number, since it uses less digits than its factorization.

257166745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501 (or 3490 counting only the distinct ones).

The product of its digits is 352800, while the sum is 43.

The square root of 257166745 is about 16036.4193322574. The cubic root of 257166745 is about 635.9235903946.

The spelling of 257166745 in words is "two hundred fifty-seven million, one hundred sixty-six thousand, seven hundred forty-five".