4278517256385 has 24 divisors (see below), whose sum is σ = 7474491048960. Its totient is φ = 2263908340512.

The previous prime is 4278517256309. The next prime is 4278517256423. The reversal of 4278517256385 is 5836527158724.

4278517256385 is a `hidden beast` number, since 4 + 2 + 7 + 85 + 172 + 5 + 6 + 385 = 666.

It is not a de Polignac number, because 4278517256385 - 2¹³ = 4278517248193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 374317755 + ... + 374329184.

It is an arithmetic number, because the mean of its divisors is an integer number (311437127040).

Almost surely, 2^{4278517256385} is an apocalyptic number.

4278517256385 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4278517256385 is a deficient number, since it is larger than the sum of its proper divisors (3195973792575).

4278517256385 is a wasteful number, since it uses less digits than its factorization.

4278517256385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748647077 (or 748647074 counting only the distinct ones).

The product of its digits is 112896000, while the sum is 63.

The spelling of 4278517256385 in words is "four trillion, two hundred seventy-eight billion, five hundred seventeen million, two hundred fifty-six thousand, three hundred eighty-five".