257263887247 has 16 divisors (see below), whose sum is σ = 262231905600. Its totient is φ = 252336218112.

The previous prime is 257263887233. The next prime is 257263887253. The reversal of 257263887247 is 742788362752.

It is a cyclic number.

It is not a de Polignac number, because 257263887247 - 2⁷ = 257263887119 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 (257263887217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42081663 + ... + 42087775.

It is an arithmetic number, because the mean of its divisors is an integer number (16389494100).

Almost surely, 2^257263887247 is an apocalyptic number.

257263887247 is a deficient number, since it is larger than the sum of its proper divisors (4968018353).

257263887247 is a wasteful number, since it uses less digits than its factorization.

257263887247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9282.

The product of its digits is 63221760, while the sum is 61.

The spelling of 257263887247 in words is "two hundred fifty-seven billion, two hundred sixty-three million, eight hundred eighty-seven thousand, two hundred forty-seven".