256384649878 has 8 divisors (see below), whose sum is σ = 439516542672. Its totient is φ = 109879135656.

The previous prime is 256384649849. The next prime is 256384649921. The reversal of 256384649878 is 878946483652.

It is a happy number.

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

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, 9156594625 + ... + 9156594652.

It is an arithmetic number, because the mean of its divisors is an integer number (54939567834).

Almost surely, 2^256384649878 is an apocalyptic number.

256384649878 is a deficient number, since it is larger than the sum of its proper divisors (183131892794).

256384649878 is a wasteful number, since it uses less digits than its factorization.

256384649878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18313189286.

The product of its digits is 557383680, while the sum is 70.

The spelling of 256384649878 in words is "two hundred fifty-six billion, three hundred eighty-four million, six hundred forty-nine thousand, eight hundred seventy-eight".