257718035421 has 96 divisors (see below), whose sum is σ = 482137463808. Its totient is φ = 133647978240.

The previous prime is 257718035389. The next prime is 257718035441. The reversal of 257718035421 is 124530817752.

257718035421 is a `hidden beast` number, since 2 + 57 + 71 + 80 + 35 + 421 = 666.

It is not a de Polignac number, because 257718035421 - 2⁵ = 257718035389 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257718035441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11084010 + ... + 11107236.

It is an arithmetic number, because the mean of its divisors is an integer number (5022265248).

Almost surely, 2^257718035421 is an apocalyptic number.

257718035421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

257718035421 is a deficient number, since it is larger than the sum of its proper divisors (224419428387).

257718035421 is a wasteful number, since it uses less digits than its factorization.

257718035421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23853 (or 23841 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 257718035421 in words is "two hundred fifty-seven billion, seven hundred eighteen million, thirty-five thousand, four hundred twenty-one".