257686047071 has 4 divisors (see below), whose sum is σ = 268889788272. Its totient is φ = 246482305872.

The previous prime is 257686046951. The next prime is 257686047077. The reversal of 257686047071 is 170740686752.

It is a happy number.

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-257686047071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257686047077) 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, 5601870566 + ... + 5601870611.

It is an arithmetic number, because the mean of its divisors is an integer number (67222447068).

Almost surely, 2^257686047071 is an apocalyptic number.

257686047071 is a deficient number, since it is larger than the sum of its proper divisors (11203741201).

257686047071 is a wasteful number, since it uses less digits than its factorization.

257686047071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11203741200.

The product of its (nonzero) digits is 3951360, while the sum is 53.

The spelling of 257686047071 in words is "two hundred fifty-seven billion, six hundred eighty-six million, forty-seven thousand, seventy-one".