256417157 has 8 divisors (see below), whose sum is σ = 263837952. Its totient is φ = 249052000.

The previous prime is 256417153. The next prime is 256417169. The reversal of 256417157 is 751714652.

256417157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 256417157 - 2² = 256417153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256417157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256417153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4469 + ... + 23082.

It is an arithmetic number, because the mean of its divisors is an integer number (32979744).

Almost surely, 2^256417157 is an apocalyptic number.

It is an amenable number.

256417157 is a deficient number, since it is larger than the sum of its proper divisors (7420795).

256417157 is a wasteful number, since it uses less digits than its factorization.

256417157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27819.

The product of its digits is 58800, while the sum is 38.

The square root of 256417157 is about 16013.0308499047. The cubic root of 256417157 is about 635.3051270889.

The spelling of 256417157 in words is "two hundred fifty-six million, four hundred seventeen thousand, one hundred fifty-seven".