25778609471 has 2 divisors, whose sum is σ = 25778609472. Its totient is φ = 25778609470.

The previous prime is 25778609459. The next prime is 25778609473. The reversal of 25778609471 is 17490687752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25778609471 is a prime.

It is a super-3 number, since 3×25778609471³ (a number of 32 digits) contains 333 as substring.

Together with 25778609473, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25778609473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12889304735 + 12889304736.

It is an arithmetic number, because the mean of its divisors is an integer number (12889304736).

Almost surely, 2^25778609471 is an apocalyptic number.

25778609471 is a deficient number, since it is larger than the sum of its proper divisors (1).

25778609471 is an equidigital number, since it uses as much as digits as its factorization.

25778609471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5927040, while the sum is 56.

The spelling of 25778609471 in words is "twenty-five billion, seven hundred seventy-eight million, six hundred nine thousand, four hundred seventy-one".