256545157 has 8 divisors (see below), whose sum is σ = 284611680. Its totient is φ = 229269360.

The previous prime is 256545109. The next prime is 256545167. The reversal of 256545157 is 751545652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256545157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256545167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196998 + ... + 198295.

It is an arithmetic number, because the mean of its divisors is an integer number (35576460).

Almost surely, 2^256545157 is an apocalyptic number.

It is an amenable number.

256545157 is a deficient number, since it is larger than the sum of its proper divisors (28066523).

256545157 is a wasteful number, since it uses less digits than its factorization.

256545157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395363.

The product of its digits is 210000, while the sum is 40.

The square root of 256545157 is about 16017.0270961874. The cubic root of 256545157 is about 635.4108214320.

The spelling of 256545157 in words is "two hundred fifty-six million, five hundred forty-five thousand, one hundred fifty-seven".