25506116197 has 2 divisors, whose sum is σ = 25506116198. Its totient is φ = 25506116196.

The previous prime is 25506116191. The next prime is 25506116203. The reversal of 25506116197 is 79161160552.

It is a balanced prime because it is at equal distance from previous prime (25506116191) and next prime (25506116203).

It can be written as a sum of positive squares in only one way, i.e., 20976018561 + 4530097636 = 144831^2 + 67306^2 .

It is a cyclic number.

It is not a de Polignac number, because 25506116197 - 2¹⁵ = 25506083429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25506116191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12753058098 + 12753058099.

It is an arithmetic number, because the mean of its divisors is an integer number (12753058099).

Almost surely, 2^25506116197 is an apocalyptic number.

It is an amenable number.

25506116197 is a deficient number, since it is larger than the sum of its proper divisors (1).

25506116197 is an equidigital number, since it uses as much as digits as its factorization.

25506116197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 25506116197 in words is "twenty-five billion, five hundred six million, one hundred sixteen thousand, one hundred ninety-seven".