25321545217 has 2 divisors, whose sum is σ = 25321545218. Its totient is φ = 25321545216.

The previous prime is 25321545211. The next prime is 25321545241. The reversal of 25321545217 is 71254512352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21478661136 + 3842884081 = 146556^2 + 61991^2 .

It is a cyclic number.

It is not a de Polignac number, because 25321545217 - 2¹⁵ = 25321512449 is a prime.

It is not a weakly prime, because it can be changed into another prime (25321545211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12660772608 + 12660772609.

It is an arithmetic number, because the mean of its divisors is an integer number (12660772609).

Almost surely, 2^25321545217 is an apocalyptic number.

It is an amenable number.

25321545217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25321545217 is an equidigital number, since it uses as much as digits as its factorization.

25321545217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84000, while the sum is 37.

The spelling of 25321545217 in words is "twenty-five billion, three hundred twenty-one million, five hundred forty-five thousand, two hundred seventeen".