25427564501813 has 2 divisors, whose sum is σ = 25427564501814. Its totient is φ = 25427564501812.

The previous prime is 25427564501771. The next prime is 25427564501821. The reversal of 25427564501813 is 31810546572452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22560391049284 + 2867173452529 = 4749778^2 + 1693273^2 .

It is a cyclic number.

It is not a de Polignac number, because 25427564501813 - 2¹⁶ = 25427564436277 is a prime.

It is a super-2 number, since 2×25427564501813² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25427564501863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12713782250906 + 12713782250907.

It is an arithmetic number, because the mean of its divisors is an integer number (12713782250907).

Almost surely, 2^{25427564501813} is an apocalyptic number.

It is an amenable number.

25427564501813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25427564501813 is an equidigital number, since it uses as much as digits as its factorization.

25427564501813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064000, while the sum is 53.

The spelling of 25427564501813 in words is "twenty-five trillion, four hundred twenty-seven billion, five hundred sixty-four million, five hundred one thousand, eight hundred thirteen".