256723837545 has 32 divisors (see below), whose sum is σ = 469646853120. Its totient is φ = 117307224000.

The previous prime is 256723837541. The next prime is 256723837549. The reversal of 256723837545 is 545738327652.

It is an interprime number because it is at equal distance from previous prime (256723837541) and next prime (256723837549).

It is not a de Polignac number, because 256723837545 - 2² = 256723837541 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (256723837541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 306735 + ... + 779444.

It is an arithmetic number, because the mean of its divisors is an integer number (14676464160).

Almost surely, 2^256723837545 is an apocalyptic number.

It is an amenable number.

256723837545 is a deficient number, since it is larger than the sum of its proper divisors (212923015575).

256723837545 is a wasteful number, since it uses less digits than its factorization.

256723837545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088445.

The product of its digits is 42336000, while the sum is 57.

The spelling of 256723837545 in words is "two hundred fifty-six billion, seven hundred twenty-three million, eight hundred thirty-seven thousand, five hundred forty-five".