25601005541 has 2 divisors, whose sum is σ = 25601005542. Its totient is φ = 25601005540.

The previous prime is 25601005501. The next prime is 25601005561. The reversal of 25601005541 is 14550010652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21647236900 + 3953768641 = 147130^2 + 62879^2 .

It is a cyclic number.

It is not a de Polignac number, because 25601005541 - 2¹⁴ = 25600989157 is a prime.

It is a super-2 number, since 2×25601005541² (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 (25601005501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12800502770 + 12800502771.

It is an arithmetic number, because the mean of its divisors is an integer number (12800502771).

Almost surely, 2^25601005541 is an apocalyptic number.

It is an amenable number.

25601005541 is a deficient number, since it is larger than the sum of its proper divisors (1).

25601005541 is an equidigital number, since it uses as much as digits as its factorization.

25601005541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 25601005541 in words is "twenty-five billion, six hundred one million, five thousand, five hundred forty-one".