25561346137 has 2 divisors, whose sum is σ = 25561346138. Its totient is φ = 25561346136.

The previous prime is 25561346131. The next prime is 25561346159. The reversal of 25561346137 is 73164316552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22471209216 + 3090136921 = 149904^2 + 55589^2 .

It is a cyclic number.

It is not a de Polignac number, because 25561346137 - 2²⁷ = 25427128409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25561346093 and 25561346102.

It is not a weakly prime, because it can be changed into another prime (25561346131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12780673068 + 12780673069.

It is an arithmetic number, because the mean of its divisors is an integer number (12780673069).

Almost surely, 2^25561346137 is an apocalyptic number.

It is an amenable number.

25561346137 is a deficient number, since it is larger than the sum of its proper divisors (1).

25561346137 is an equidigital number, since it uses as much as digits as its factorization.

25561346137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 43.

The spelling of 25561346137 in words is "twenty-five billion, five hundred sixty-one million, three hundred forty-six thousand, one hundred thirty-seven".