245631128257 has 2 divisors, whose sum is σ = 245631128258. Its totient is φ = 245631128256.

The previous prime is 245631128251. The next prime is 245631128333. The reversal of 245631128257 is 752821136542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239903060401 + 5728067856 = 489799^2 + 75684^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245631128257 is a prime.

It is a super-3 number, since 3×245631128257³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (245631128251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122815564128 + 122815564129.

It is an arithmetic number, because the mean of its divisors is an integer number (122815564129).

Almost surely, 2^245631128257 is an apocalyptic number.

It is an amenable number.

245631128257 is a deficient number, since it is larger than the sum of its proper divisors (1).

245631128257 is an equidigital number, since it uses as much as digits as its factorization.

245631128257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806400, while the sum is 46.

The spelling of 245631128257 in words is "two hundred forty-five billion, six hundred thirty-one million, one hundred twenty-eight thousand, two hundred fifty-seven".