25721423671 has 2 divisors, whose sum is σ = 25721423672. Its totient is φ = 25721423670.

The previous prime is 25721423669. The next prime is 25721423701. The reversal of 25721423671 is 17632412752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25721423671 - 2¹ = 25721423669 is a prime.

Together with 25721423669, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25721423171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12860711835 + 12860711836.

It is an arithmetic number, because the mean of its divisors is an integer number (12860711836).

Almost surely, 2^25721423671 is an apocalyptic number.

25721423671 is a deficient number, since it is larger than the sum of its proper divisors (1).

25721423671 is an equidigital number, since it uses as much as digits as its factorization.

25721423671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 40.

The spelling of 25721423671 in words is "twenty-five billion, seven hundred twenty-one million, four hundred twenty-three thousand, six hundred seventy-one".