257985458838 has 16 divisors (see below), whose sum is σ = 573301019760. Its totient is φ = 85995152928.

The previous prime is 257985458833. The next prime is 257985458839. The reversal of 257985458838 is 838854589752.

It is a happy number.

257985458838 is a `hidden beast` number, since 2 + 5 + 7 + 9 + 8 + 5 + 4 + 588 + 38 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257985458833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2388754195 + ... + 2388754302.

It is an arithmetic number, because the mean of its divisors is an integer number (35831313735).

Almost surely, 2^257985458838 is an apocalyptic number.

257985458838 is an abundant number, since it is smaller than the sum of its proper divisors (315315560922).

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

257985458838 is a wasteful number, since it uses less digits than its factorization.

257985458838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4777508508 (or 4777508502 counting only the distinct ones).

The product of its digits is 774144000, while the sum is 72.

The spelling of 257985458838 in words is "two hundred fifty-seven billion, nine hundred eighty-five million, four hundred fifty-eight thousand, eight hundred thirty-eight".