257081447438 has 8 divisors (see below), whose sum is σ = 391943846280. Its totient is φ = 126433498680.

The previous prime is 257081447431. The next prime is 257081447453. The reversal of 257081447438 is 834744180752.

It is a happy number.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 257081447438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257081447431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053612368 + ... + 1053612611.

It is an arithmetic number, because the mean of its divisors is an integer number (48992980785).

Almost surely, 2^257081447438 is an apocalyptic number.

257081447438 is a deficient number, since it is larger than the sum of its proper divisors (134862398842).

257081447438 is a wasteful number, since it uses less digits than its factorization.

257081447438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107225042.

The product of its (nonzero) digits is 6021120, while the sum is 53.

The spelling of 257081447438 in words is "two hundred fifty-seven billion, eighty-one million, four hundred forty-seven thousand, four hundred thirty-eight".