257439802563 has 6 divisors (see below), whose sum is σ = 371857492604. Its totient is φ = 171626535036.

The previous prime is 257439802547. The next prime is 257439802597. The reversal of 257439802563 is 365208934752.

257439802563 is a `hidden beast` number, since 2 + 5 + 74 + 3 + 9 + 8 + 0 + 2 + 563 = 666.

It is not a de Polignac number, because 257439802563 - 2⁴ = 257439802547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257439802513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14302211245 + ... + 14302211262.

Almost surely, 2^257439802563 is an apocalyptic number.

257439802563 is a deficient number, since it is larger than the sum of its proper divisors (114417690041).

257439802563 is a wasteful number, since it uses less digits than its factorization.

257439802563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28604422513 (or 28604422510 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 54.

The spelling of 257439802563 in words is "two hundred fifty-seven billion, four hundred thirty-nine million, eight hundred two thousand, five hundred sixty-three".