257340616861 has 16 divisors (see below), whose sum is σ = 263213323200.
Its totient is φ = 251507476480.
The previous prime is 257340616837. The next prime is 257340616909. The reversal of 257340616861 is 168616043752.
It is a cyclic number.
It is not a de Polignac number, because 257340616861 - 229 = 256803745949 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (257340616261) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15041490 + ... + 15058588.
It is an arithmetic number, because the mean of its divisors is an integer number (16450832700).
Almost surely, 2257340616861 is an apocalyptic number.
It is an amenable number.
257340616861 is a deficient number, since it is larger than the sum of its proper divisors (5872706339).
257340616861 is a wasteful number, since it uses less digits than its factorization.
257340616861 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 18236.
The product of its (nonzero) digits is 1451520, while the sum is 49.
The spelling of 257340616861 in words is "two hundred fifty-seven billion, three hundred forty million, six hundred sixteen thousand, eight hundred sixty-one".