256507724542073 has 4 divisors (see below), whose sum is σ = 257268875060340. Its totient is φ = 255746574023808.

The previous prime is 256507724542061. The next prime is 256507724542079. The reversal of 256507724542073 is 370245427705652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39427812630649 + 217079911911424 = 6279157^2 + 14733632^2 .

It is a cyclic number.

It is not a de Polignac number, because 256507724542073 - 2⁴ = 256507724542057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256507724542079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380575258628 + ... + 380575259301.

It is an arithmetic number, because the mean of its divisors is an integer number (64317218765085).

Almost surely, 2^{256507724542073} is an apocalyptic number.

It is an amenable number.

256507724542073 is a deficient number, since it is larger than the sum of its proper divisors (761150518267).

256507724542073 is an equidigital number, since it uses as much as digits as its factorization.

256507724542073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761150518266.

The product of its (nonzero) digits is 98784000, while the sum is 59.

The spelling of 256507724542073 in words is "two hundred fifty-six trillion, five hundred seven billion, seven hundred twenty-four million, five hundred forty-two thousand, seventy-three".