256163522149 has 2 divisors, whose sum is σ = 256163522150. Its totient is φ = 256163522148.

The previous prime is 256163522099. The next prime is 256163522191. The reversal of 256163522149 is 941225361652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217351764100 + 38811758049 = 466210^2 + 197007^2 .

It is a cyclic number.

It is not a de Polignac number, because 256163522149 - 2³³ = 247573587557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256163522099 and 256163522108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256163526149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128081761074 + 128081761075.

It is an arithmetic number, because the mean of its divisors is an integer number (128081761075).

Almost surely, 2^256163522149 is an apocalyptic number.

It is an amenable number.

256163522149 is a deficient number, since it is larger than the sum of its proper divisors (1).

256163522149 is an equidigital number, since it uses as much as digits as its factorization.

256163522149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 46.

The spelling of 256163522149 in words is "two hundred fifty-six billion, one hundred sixty-three million, five hundred twenty-two thousand, one hundred forty-nine".