257844352225 has 6 divisors (see below), whose sum is σ = 319726996790. Its totient is φ = 206275481760.

The previous prime is 257844352223. The next prime is 257844352231. The reversal of 257844352225 is 522253448752.

It can be written as a sum of positive squares in 3 ways, for example, as 28066971024 + 229777381201 = 167532^2 + 479351^2 .

It is not a de Polignac number, because 257844352225 - 2¹ = 257844352223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257844352223) 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, 5156887020 + ... + 5156887069.

Almost surely, 2^257844352225 is an apocalyptic number.

257844352225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

257844352225 is a deficient number, since it is larger than the sum of its proper divisors (61882644565).

257844352225 is a wasteful number, since it uses less digits than its factorization.

257844352225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10313774099 (or 10313774094 counting only the distinct ones).

The product of its digits is 5376000, while the sum is 49.

The spelling of 257844352225 in words is "two hundred fifty-seven billion, eight hundred forty-four million, three hundred fifty-two thousand, two hundred twenty-five".