25605145253 has 2 divisors, whose sum is σ = 25605145254. Its totient is φ = 25605145252.

The previous prime is 25605145231. The next prime is 25605145283. The reversal of 25605145253 is 35254150652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23333479009 + 2271666244 = 152753^2 + 47662^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25605145253 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25605145283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12802572626 + 12802572627.

It is an arithmetic number, because the mean of its divisors is an integer number (12802572627).

Almost surely, 2^25605145253 is an apocalyptic number.

It is an amenable number.

25605145253 is a deficient number, since it is larger than the sum of its proper divisors (1).

25605145253 is an equidigital number, since it uses as much as digits as its factorization.

25605145253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180000, while the sum is 38.

The spelling of 25605145253 in words is "twenty-five billion, six hundred five million, one hundred forty-five thousand, two hundred fifty-three".