25217712547 has 2 divisors, whose sum is σ = 25217712548. Its totient is φ = 25217712546.

The previous prime is 25217712493. The next prime is 25217712581. The reversal of 25217712547 is 74521771252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25217712547 - 2⁷ = 25217712419 is a prime.

It is a super-2 number, since 2×25217712547² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25217722547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12608856273 + 12608856274.

It is an arithmetic number, because the mean of its divisors is an integer number (12608856274).

Almost surely, 2^25217712547 is an apocalyptic number.

25217712547 is a deficient number, since it is larger than the sum of its proper divisors (1).

25217712547 is an equidigital number, since it uses as much as digits as its factorization.

25217712547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 274400, while the sum is 43.

The spelling of 25217712547 in words is "twenty-five billion, two hundred seventeen million, seven hundred twelve thousand, five hundred forty-seven".