25546601779 has 2 divisors, whose sum is σ = 25546601780. Its totient is φ = 25546601778.

The previous prime is 25546601771. The next prime is 25546601833. The reversal of 25546601779 is 97710664552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25546601779 - 2³ = 25546601771 is a prime.

It is not a weakly prime, because it can be changed into another prime (25546601771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12773300889 + 12773300890.

It is an arithmetic number, because the mean of its divisors is an integer number (12773300890).

Almost surely, 2^25546601779 is an apocalyptic number.

25546601779 is a deficient number, since it is larger than the sum of its proper divisors (1).

25546601779 is an equidigital number, since it uses as much as digits as its factorization.

25546601779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3175200, while the sum is 52.

The spelling of 25546601779 in words is "twenty-five billion, five hundred forty-six million, six hundred one thousand, seven hundred seventy-nine".