25646354644049 has 2 divisors, whose sum is σ = 25646354644050. Its totient is φ = 25646354644048.

The previous prime is 25646354644037. The next prime is 25646354644067. The reversal of 25646354644049 is 94044645364652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20046600339649 + 5599754304400 = 4477343^2 + 2366380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25646354644049 is a prime.

It is a super-2 number, since 2×25646354644049² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25646354643982 and 25646354644000.

It is not a weakly prime, because it can be changed into another prime (25646354641049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12823177322024 + 12823177322025.

It is an arithmetic number, because the mean of its divisors is an integer number (12823177322025).

Almost surely, 2^{25646354644049} is an apocalyptic number.

It is an amenable number.

25646354644049 is a deficient number, since it is larger than the sum of its proper divisors (1).

25646354644049 is an equidigital number, since it uses as much as digits as its factorization.

25646354644049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 298598400, while the sum is 62.

The spelling of 25646354644049 in words is "twenty-five trillion, six hundred forty-six billion, three hundred fifty-four million, six hundred forty-four thousand, forty-nine".