257785478680 has 16 divisors (see below), whose sum is σ = 580017327120. Its totient is φ = 103114191456.

The previous prime is 257785478677. The next prime is 257785478711. The reversal of 257785478680 is 86874587752.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3222318444 + ... + 3222318523.

It is an arithmetic number, because the mean of its divisors is an integer number (36251082945).

Almost surely, 2^257785478680 is an apocalyptic number.

257785478680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257785478680 is an abundant number, since it is smaller than the sum of its proper divisors (322231848440).

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

257785478680 is a wasteful number, since it uses less digits than its factorization.

257785478680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6444636978 (or 6444636974 counting only the distinct ones).

The product of its (nonzero) digits is 210739200, while the sum is 67.

The spelling of 257785478680 in words is "two hundred fifty-seven billion, seven hundred eighty-five million, four hundred seventy-eight thousand, six hundred eighty".