25555417843 has 2 divisors, whose sum is σ = 25555417844. Its totient is φ = 25555417842.

The previous prime is 25555417781. The next prime is 25555417847. The reversal of 25555417843 is 34871455552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25555417843 - 2¹³ = 25555409651 is a prime.

It is a super-2 number, since 2×25555417843² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25555417847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12777708921 + 12777708922.

It is an arithmetic number, because the mean of its divisors is an integer number (12777708922).

Almost surely, 2^25555417843 is an apocalyptic number.

25555417843 is a deficient number, since it is larger than the sum of its proper divisors (1).

25555417843 is an equidigital number, since it uses as much as digits as its factorization.

25555417843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360000, while the sum is 49.

The spelling of 25555417843 in words is "twenty-five billion, five hundred fifty-five million, four hundred seventeen thousand, eight hundred forty-three".