257385811740 has 48 divisors (see below), whose sum is σ = 720702323712. Its totient is φ = 68634116416.

The previous prime is 257385811733. The next prime is 257385811799. The reversal of 257385811740 is 47118583752.

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, 3654337 + ... + 3724103.

It is an arithmetic number, because the mean of its divisors is an integer number (15014631744).

Almost surely, 2^257385811740 is an apocalyptic number.

257385811740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257385811740 is an abundant number, since it is smaller than the sum of its proper divisors (463316511972).

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

257385811740 is a wasteful number, since it uses less digits than its factorization.

257385811740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131266 (or 131264 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 51.

The spelling of 257385811740 in words is "two hundred fifty-seven billion, three hundred eighty-five million, eight hundred eleven thousand, seven hundred forty".