257895978899 has 4 divisors (see below), whose sum is σ = 277734131136. Its totient is φ = 238057826664.

The previous prime is 257895978853. The next prime is 257895978929. The reversal of 257895978899 is 998879598752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257895978899 - 2⁸ = 257895978643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257895978899.

It is not an unprimeable number, because it can be changed into a prime (257895978839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9919076099 + ... + 9919076124.

It is an arithmetic number, because the mean of its divisors is an integer number (69433532784).

Almost surely, 2^257895978899 is an apocalyptic number.

257895978899 is a deficient number, since it is larger than the sum of its proper divisors (19838152237).

257895978899 is a wasteful number, since it uses less digits than its factorization.

257895978899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19838152236.

The product of its digits is 8230118400, while the sum is 86.

The spelling of 257895978899 in words is "two hundred fifty-seven billion, eight hundred ninety-five million, nine hundred seventy-eight thousand, eight hundred ninety-nine".