256419873439 has 8 divisors (see below), whose sum is σ = 271943444448. Its totient is φ = 240945196800.

The previous prime is 256419873403. The next prime is 256419873467. The reversal of 256419873439 is 934378914652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256419873439 - 2¹¹ = 256419871391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256419873469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12212787 + ... + 12233764.

It is an arithmetic number, because the mean of its divisors is an integer number (33992930556).

Almost surely, 2^256419873439 is an apocalyptic number.

256419873439 is a deficient number, since it is larger than the sum of its proper divisors (15523571009).

256419873439 is a wasteful number, since it uses less digits than its factorization.

256419873439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24447185.

The product of its digits is 39191040, while the sum is 61.

The spelling of 256419873439 in words is "two hundred fifty-six billion, four hundred nineteen million, eight hundred seventy-three thousand, four hundred thirty-nine".