257306044291 has 4 divisors (see below), whose sum is σ = 268493263632. Its totient is φ = 246118824952.

The previous prime is 257306044267. The next prime is 257306044321. The reversal of 257306044291 is 192440603752.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257306044291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257306044591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5593609636 + ... + 5593609681.

It is an arithmetic number, because the mean of its divisors is an integer number (67123315908).

Almost surely, 2^257306044291 is an apocalyptic number.

257306044291 is a deficient number, since it is larger than the sum of its proper divisors (11187219341).

257306044291 is a wasteful number, since it uses less digits than its factorization.

257306044291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11187219340.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 257306044291 in words is "two hundred fifty-seven billion, three hundred six million, forty-four thousand, two hundred ninety-one".