257661135271 has 4 divisors (see below), whose sum is σ = 257663093544. Its totient is φ = 257659177000.

The previous prime is 257661135269. The next prime is 257661135293. The reversal of 257661135271 is 172531166752.

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 257661135271 - 2¹ = 257661135269 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 (257661135071) 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, 766360 + ... + 1050061.

It is an arithmetic number, because the mean of its divisors is an integer number (64415773386).

Almost surely, 2^257661135271 is an apocalyptic number.

257661135271 is a deficient number, since it is larger than the sum of its proper divisors (1958273).

257661135271 is a wasteful number, since it uses less digits than its factorization.

257661135271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958272.

The product of its digits is 529200, while the sum is 46.

The spelling of 257661135271 in words is "two hundred fifty-seven billion, six hundred sixty-one million, one hundred thirty-five thousand, two hundred seventy-one".