257249778989 has 16 divisors (see below), whose sum is σ = 296903422080. Its totient is φ = 218332117440.

The previous prime is 257249778983. The next prime is 257249779027. The reversal of 257249778989 is 989877942752.

It is a cyclic number.

It is not a de Polignac number, because 257249778989 - 2¹⁶ = 257249713453 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 (257249778983) 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, 112142 + ... + 725999.

It is an arithmetic number, because the mean of its divisors is an integer number (18556463880).

Almost surely, 2^257249778989 is an apocalyptic number.

It is an amenable number.

257249778989 is a deficient number, since it is larger than the sum of its proper divisors (39653643091).

257249778989 is a wasteful number, since it uses less digits than its factorization.

257249778989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838580.

The product of its digits is 1280240640, while the sum is 77.

The spelling of 257249778989 in words is "two hundred fifty-seven billion, two hundred forty-nine million, seven hundred seventy-eight thousand, nine hundred eighty-nine".