25420688819 has 2 divisors, whose sum is σ = 25420688820. Its totient is φ = 25420688818.

The previous prime is 25420688779. The next prime is 25420688831. The reversal of 25420688819 is 91888602452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25420688819 - 2²⁰ = 25419640243 is a prime.

It is a super-2 number, since 2×25420688819² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25420688879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12710344409 + 12710344410.

It is an arithmetic number, because the mean of its divisors is an integer number (12710344410).

Almost surely, 2^25420688819 is an apocalyptic number.

25420688819 is a deficient number, since it is larger than the sum of its proper divisors (1).

25420688819 is an equidigital number, since it uses as much as digits as its factorization.

25420688819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2211840, while the sum is 53.

The spelling of 25420688819 in words is "twenty-five billion, four hundred twenty million, six hundred eighty-eight thousand, eight hundred nineteen".