256163651 has 2 divisors, whose sum is σ = 256163652. Its totient is φ = 256163650.

The previous prime is 256163639. The next prime is 256163657. The reversal of 256163651 is 156361652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256163651 - 2¹⁸ = 255901507 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256163657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128081825 + 128081826.

It is an arithmetic number, because the mean of its divisors is an integer number (128081826).

Almost surely, 2^256163651 is an apocalyptic number.

256163651 is a deficient number, since it is larger than the sum of its proper divisors (1).

256163651 is an equidigital number, since it uses as much as digits as its factorization.

256163651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

The square root of 256163651 is about 16005.1132767000. The cubic root of 256163651 is about 635.0956939297.

The spelling of 256163651 in words is "two hundred fifty-six million, one hundred sixty-three thousand, six hundred fifty-one".