25211512517 has 2 divisors, whose sum is σ = 25211512518. Its totient is φ = 25211512516.

The previous prime is 25211512457. The next prime is 25211512531. The reversal of 25211512517 is 71521511252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15147209476 + 10064303041 = 123074^2 + 100321^2 .

It is a cyclic number.

It is not a de Polignac number, because 25211512517 - 2¹⁴ = 25211496133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25211512577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12605756258 + 12605756259.

It is an arithmetic number, because the mean of its divisors is an integer number (12605756259).

Almost surely, 2^25211512517 is an apocalyptic number.

It is an amenable number.

25211512517 is a deficient number, since it is larger than the sum of its proper divisors (1).

25211512517 is an equidigital number, since it uses as much as digits as its factorization.

25211512517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7000, while the sum is 32.

The spelling of 25211512517 in words is "twenty-five billion, two hundred eleven million, five hundred twelve thousand, five hundred seventeen".