25676767449 has 10 divisors (see below), whose sum is σ = 38356652730. Its totient is φ = 17117844912.

The previous prime is 25676767421. The next prime is 25676767499. The reversal of 25676767449 is 94476767652.

It is a happy number.

25676767449 is a `hidden beast` number, since 2 + 56 + 76 + 76 + 7 + 449 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23629838400 + 2046929049 = 153720^2 + 45243^2 .

It is not a de Polignac number, because 25676767449 - 2⁷ = 25676767321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25676767499) 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 in 9 ways as a sum of consecutive naturals, for example, 158498484 + ... + 158498645.

It is an arithmetic number, because the mean of its divisors is an integer number (3835665273).

Almost surely, 2^25676767449 is an apocalyptic number.

It is an amenable number.

25676767449 is a deficient number, since it is larger than the sum of its proper divisors (12679885281).

25676767449 is an equidigital number, since it uses as much as digits as its factorization.

25676767449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316997141 (or 316997132 counting only the distinct ones).

The product of its digits is 106686720, while the sum is 63.

The spelling of 25676767449 in words is "twenty-five billion, six hundred seventy-six million, seven hundred sixty-seven thousand, four hundred forty-nine".