25049938169 has 2 divisors, whose sum is σ = 25049938170. Its totient is φ = 25049938168.

The previous prime is 25049938117. The next prime is 25049938183. The reversal of 25049938169 is 96183994052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24558650944 + 491287225 = 156712^2 + 22165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25049938169 is a prime.

It is a super-2 number, since 2×25049938169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25049938189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12524969084 + 12524969085.

It is an arithmetic number, because the mean of its divisors is an integer number (12524969085).

Almost surely, 2^25049938169 is an apocalyptic number.

It is an amenable number.

25049938169 is a deficient number, since it is larger than the sum of its proper divisors (1).

25049938169 is an equidigital number, since it uses as much as digits as its factorization.

25049938169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4199040, while the sum is 56.

The spelling of 25049938169 in words is "twenty-five billion, forty-nine million, nine hundred thirty-eight thousand, one hundred sixty-nine".