257017827878 has 8 divisors (see below), whose sum is σ = 440601990672. Its totient is φ = 110150497656.

The previous prime is 257017827853. The next prime is 257017827893. The reversal of 257017827878 is 878728710752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 257017827878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9179208125 + ... + 9179208152.

It is an arithmetic number, because the mean of its divisors is an integer number (55075248834).

Almost surely, 2^257017827878 is an apocalyptic number.

257017827878 is a deficient number, since it is larger than the sum of its proper divisors (183584162794).

257017827878 is a wasteful number, since it uses less digits than its factorization.

257017827878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18358416286.

The product of its (nonzero) digits is 24586240, while the sum is 62.

The spelling of 257017827878 in words is "two hundred fifty-seven billion, seventeen million, eight hundred twenty-seven thousand, eight hundred seventy-eight".