256157573 has 4 divisors (see below), whose sum is σ = 292751520. Its totient is φ = 219563628.

The previous prime is 256157569. The next prime is 256157591. The reversal of 256157573 is 375751652.

256157573 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256157573 - 2² = 256157569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256157573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256157543) 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, 18296963 + ... + 18296976.

It is an arithmetic number, because the mean of its divisors is an integer number (73187880).

Almost surely, 2^256157573 is an apocalyptic number.

It is an amenable number.

256157573 is a deficient number, since it is larger than the sum of its proper divisors (36593947).

256157573 is an equidigital number, since it uses as much as digits as its factorization.

256157573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36593946.

The product of its digits is 220500, while the sum is 41.

The square root of 256157573 is about 16004.9233987545. The cubic root of 256157573 is about 635.0906709140.

The spelling of 256157573 in words is "two hundred fifty-six million, one hundred fifty-seven thousand, five hundred seventy-three".