256723837583 has 2 divisors, whose sum is σ = 256723837584. Its totient is φ = 256723837582.

The previous prime is 256723837549. The next prime is 256723837673. The reversal of 256723837583 is 385738327652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256723837583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256723897583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128361918791 + 128361918792.

It is an arithmetic number, because the mean of its divisors is an integer number (128361918792).

Almost surely, 2^256723837583 is an apocalyptic number.

256723837583 is a deficient number, since it is larger than the sum of its proper divisors (1).

256723837583 is an equidigital number, since it uses as much as digits as its factorization.

256723837583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50803200, while the sum is 59.

The spelling of 256723837583 in words is "two hundred fifty-six billion, seven hundred twenty-three million, eight hundred thirty-seven thousand, five hundred eighty-three".