257917908280920 has 64 divisors (see below), whose sum is σ = 774125186814720. Its totient is φ = 68745090033024.

The previous prime is 257917908280891. The next prime is 257917908281083. The reversal of 257917908280920 is 29082809719752.

257917908280920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515668404 + ... + 516168323.

It is an arithmetic number, because the mean of its divisors is an integer number (12095706043980).

Almost surely, 2^{257917908280920} is an apocalyptic number.

257917908280920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257917908280920 is an abundant number, since it is smaller than the sum of its proper divisors (516207278533800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257917908280920 is a wasteful number, since it uses less digits than its factorization.

257917908280920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031838824 (or 1031838820 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 69.

The spelling of 257917908280920 in words is "two hundred fifty-seven trillion, nine hundred seventeen billion, nine hundred eight million, two hundred eighty thousand, nine hundred twenty".