257263427906 has 8 divisors (see below), whose sum is σ = 408594856140. Its totient is φ = 121065142528.

The previous prime is 257263427899. The next prime is 257263427921. The reversal of 257263427906 is 609724362752.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 198840187225 + 58423240681 = 445915^2 + 241709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3783285671 + ... + 3783285738.

Almost surely, 2^257263427906 is an apocalyptic number.

257263427906 is a deficient number, since it is larger than the sum of its proper divisors (151331428234).

257263427906 is a wasteful number, since it uses less digits than its factorization.

257263427906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7566571428.

The product of its (nonzero) digits is 7620480, while the sum is 53.

The spelling of 257263427906 in words is "two hundred fifty-seven billion, two hundred sixty-three million, four hundred twenty-seven thousand, nine hundred six".