25918494419 has 2 divisors, whose sum is σ = 25918494420. Its totient is φ = 25918494418.

The previous prime is 25918494409. The next prime is 25918494439. The reversal of 25918494419 is 91449481952.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25918494419 - 2²⁴ = 25901717203 is a prime.

It is a super-2 number, since 2×25918494419² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25918494409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12959247209 + 12959247210.

It is an arithmetic number, because the mean of its divisors is an integer number (12959247210).

Almost surely, 2^25918494419 is an apocalyptic number.

25918494419 is a deficient number, since it is larger than the sum of its proper divisors (1).

25918494419 is an equidigital number, since it uses as much as digits as its factorization.

25918494419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 56.

The spelling of 25918494419 in words is "twenty-five billion, nine hundred eighteen million, four hundred ninety-four thousand, four hundred nineteen".