256618151 has 2 divisors, whose sum is σ = 256618152. Its totient is φ = 256618150.

The previous prime is 256618147. The next prime is 256618163. The reversal of 256618151 is 151816652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256618151 - 2² = 256618147 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256618171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128309075 + 128309076.

It is an arithmetic number, because the mean of its divisors is an integer number (128309076).

Almost surely, 2^256618151 is an apocalyptic number.

256618151 is a deficient number, since it is larger than the sum of its proper divisors (1).

256618151 is an equidigital number, since it uses as much as digits as its factorization.

256618151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 35.

The square root of 256618151 is about 16019.3055717156. The cubic root of 256618151 is about 635.4710795425.

The spelling of 256618151 in words is "two hundred fifty-six million, six hundred eighteen thousand, one hundred fifty-one".