257993215456 has 12 divisors (see below), whose sum is σ = 507924142992. Its totient is φ = 128996607712.

The previous prime is 257993215451. The next prime is 257993215477. The reversal of 257993215456 is 654512399752.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 257993215456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257993215451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4031143960 + ... + 4031144023.

It is an arithmetic number, because the mean of its divisors is an integer number (42327011916).

Almost surely, 2^257993215456 is an apocalyptic number.

It is an amenable number.

257993215456 is a deficient number, since it is larger than the sum of its proper divisors (249930927536).

257993215456 is an equidigital number, since it uses as much as digits as its factorization.

257993215456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8062287993 (or 8062287985 counting only the distinct ones).

The product of its digits is 20412000, while the sum is 58.

The spelling of 257993215456 in words is "two hundred fifty-seven billion, nine hundred ninety-three million, two hundred fifteen thousand, four hundred fifty-six".