25465856443 has 2 divisors, whose sum is σ = 25465856444. Its totient is φ = 25465856442.

The previous prime is 25465856441. The next prime is 25465856453. The reversal of 25465856443 is 34465856452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25465856443 - 2¹ = 25465856441 is a prime.

It is a super-2 number, since 2×25465856443² (a number of 22 digits) contains 22 as substring.

Together with 25465856441, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25465856441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12732928221 + 12732928222.

It is an arithmetic number, because the mean of its divisors is an integer number (12732928222).

Almost surely, 2^25465856443 is an apocalyptic number.

25465856443 is a deficient number, since it is larger than the sum of its proper divisors (1).

25465856443 is an equidigital number, since it uses as much as digits as its factorization.

25465856443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824000, while the sum is 52.

Subtracting 25465856443 from its reverse (34465856452), we obtain a palindrome (9000000009).

The spelling of 25465856443 in words is "twenty-five billion, four hundred sixty-five million, eight hundred fifty-six thousand, four hundred forty-three".