256379843709 has 64 divisors (see below), whose sum is σ = 452877557760. Its totient is φ = 141524064000.

The previous prime is 256379843693. The next prime is 256379843723. The reversal of 256379843709 is 907348973652.

256379843709 is a `hidden beast` number, since 256 + 3 + 7 + 9 + 8 + 4 + 370 + 9 = 666.

It is not a de Polignac number, because 256379843709 - 2⁴ = 256379843693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256379843509) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 662487 + ... + 975524.

It is an arithmetic number, because the mean of its divisors is an integer number (7076211840).

Almost surely, 2^256379843709 is an apocalyptic number.

It is an amenable number.

256379843709 is a deficient number, since it is larger than the sum of its proper divisors (196497714051).

256379843709 is a wasteful number, since it uses less digits than its factorization.

256379843709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638079 (or 1638073 counting only the distinct ones).

The product of its (nonzero) digits is 68584320, while the sum is 63.

The spelling of 256379843709 in words is "two hundred fifty-six billion, three hundred seventy-nine million, eight hundred forty-three thousand, seven hundred nine".