25116136649 has 2 divisors, whose sum is σ = 25116136650. Its totient is φ = 25116136648.

The previous prime is 25116136631. The next prime is 25116136657. The reversal of 25116136649 is 94663161152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24713412025 + 402724624 = 157205^2 + 20068^2 .

It is a cyclic number.

It is not a de Polignac number, because 25116136649 - 2²⁴ = 25099359433 is a prime.

It is not a weakly prime, because it can be changed into another prime (25116336649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12558068324 + 12558068325.

It is an arithmetic number, because the mean of its divisors is an integer number (12558068325).

Almost surely, 2^25116136649 is an apocalyptic number.

It is an amenable number.

25116136649 is a deficient number, since it is larger than the sum of its proper divisors (1).

25116136649 is an equidigital number, since it uses as much as digits as its factorization.

25116136649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 44.

The spelling of 25116136649 in words is "twenty-five billion, one hundred sixteen million, one hundred thirty-six thousand, six hundred forty-nine".