25436504069 has 2 divisors, whose sum is σ = 25436504070. Its totient is φ = 25436504068.

The previous prime is 25436504047. The next prime is 25436504077. The reversal of 25436504069 is 96040563452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25182516100 + 253987969 = 158690^2 + 15937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25436504069 is a prime.

It is a super-2 number, since 2×25436504069² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25436504039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12718252034 + 12718252035.

It is an arithmetic number, because the mean of its divisors is an integer number (12718252035).

Almost surely, 2^25436504069 is an apocalyptic number.

It is an amenable number.

25436504069 is a deficient number, since it is larger than the sum of its proper divisors (1).

25436504069 is an equidigital number, since it uses as much as digits as its factorization.

25436504069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 25436504069 in words is "twenty-five billion, four hundred thirty-six million, five hundred four thousand, sixty-nine".