25537581211 has 2 divisors, whose sum is σ = 25537581212. Its totient is φ = 25537581210.

The previous prime is 25537581193. The next prime is 25537581227. The reversal of 25537581211 is 11218573552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25537581211 - 2¹⁷ = 25537450139 is a prime.

It is not a weakly prime, because it can be changed into another prime (25537584211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12768790605 + 12768790606.

It is an arithmetic number, because the mean of its divisors is an integer number (12768790606).

Almost surely, 2^25537581211 is an apocalyptic number.

25537581211 is a deficient number, since it is larger than the sum of its proper divisors (1).

25537581211 is an equidigital number, since it uses as much as digits as its factorization.

25537581211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84000, while the sum is 40.

The spelling of 25537581211 in words is "twenty-five billion, five hundred thirty-seven million, five hundred eighty-one thousand, two hundred eleven".