25641600349 has 2 divisors, whose sum is σ = 25641600350. Its totient is φ = 25641600348.

The previous prime is 25641600343. The next prime is 25641600377. The reversal of 25641600349 is 94300614652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16791494724 + 8850105625 = 129582^2 + 94075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25641600349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25641600343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820800174 + 12820800175.

It is an arithmetic number, because the mean of its divisors is an integer number (12820800175).

Almost surely, 2^25641600349 is an apocalyptic number.

It is an amenable number.

25641600349 is a deficient number, since it is larger than the sum of its proper divisors (1).

25641600349 is an equidigital number, since it uses as much as digits as its factorization.

25641600349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 25641600349 in words is "twenty-five billion, six hundred forty-one million, six hundred thousand, three hundred forty-nine".