25418952397 has 2 divisors, whose sum is σ = 25418952398. Its totient is φ = 25418952396.

The previous prime is 25418952289. The next prime is 25418952407. The reversal of 25418952397 is 79325981452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13293859401 + 12125092996 = 115299^2 + 110114^2 .

It is a cyclic number.

It is not a de Polignac number, because 25418952397 - 2¹⁵ = 25418919629 is a prime.

It is a super-2 number, since 2×25418952397² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25418950397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12709476198 + 12709476199.

It is an arithmetic number, because the mean of its divisors is an integer number (12709476199).

Almost surely, 2^25418952397 is an apocalyptic number.

It is an amenable number.

25418952397 is a deficient number, since it is larger than the sum of its proper divisors (1).

25418952397 is an equidigital number, since it uses as much as digits as its factorization.

25418952397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 55.

The spelling of 25418952397 in words is "twenty-five billion, four hundred eighteen million, nine hundred fifty-two thousand, three hundred ninety-seven".