257396434427 has 16 divisors (see below), whose sum is σ = 300200090112. Its totient is φ = 218094049920.

The previous prime is 257396434387. The next prime is 257396434439. The reversal of 257396434427 is 724434693752.

It is not a de Polignac number, because 257396434427 - 2⁶ = 257396434363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257396434027) 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, 6662543 + ... + 6701064.

It is an arithmetic number, because the mean of its divisors is an integer number (18762505632).

Almost surely, 2^257396434427 is an apocalyptic number.

257396434427 is a deficient number, since it is larger than the sum of its proper divisors (42803655685).

257396434427 is a wasteful number, since it uses less digits than its factorization.

257396434427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13363738.

The product of its digits is 30481920, while the sum is 56.

The spelling of 257396434427 in words is "two hundred fifty-seven billion, three hundred ninety-six million, four hundred thirty-four thousand, four hundred twenty-seven".