257545707 has 4 divisors (see below), whose sum is σ = 343394280. Its totient is φ = 171697136.

The previous prime is 257545661. The next prime is 257545727. The reversal of 257545707 is 707545752.

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

It is a cyclic number.

It is not a de Polignac number, because 257545707 - 2¹² = 257541611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257545727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42924282 + ... + 42924287.

It is an arithmetic number, because the mean of its divisors is an integer number (85848570).

Almost surely, 2^257545707 is an apocalyptic number.

257545707 is a deficient number, since it is larger than the sum of its proper divisors (85848573).

257545707 is an equidigital number, since it uses as much as digits as its factorization.

257545707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85848572.

The product of its (nonzero) digits is 343000, while the sum is 42.

The square root of 257545707 is about 16048.2306501371. The cubic root of 257545707 is about 636.2358036467.

The spelling of 257545707 in words is "two hundred fifty-seven million, five hundred forty-five thousand, seven hundred seven".