25218244201 has 2 divisors, whose sum is σ = 25218244202. Its totient is φ = 25218244200.

The previous prime is 25218244169. The next prime is 25218244213. The reversal of 25218244201 is 10244281252.

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., 23608629801 + 1609614400 = 153651^2 + 40120^2 .

It is a cyclic number.

It is not a de Polignac number, because 25218244201 - 2⁵ = 25218244169 is a prime.

It is not a weakly prime, because it can be changed into another prime (25218244801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12609122100 + 12609122101.

It is an arithmetic number, because the mean of its divisors is an integer number (12609122101).

Almost surely, 2^25218244201 is an apocalyptic number.

It is an amenable number.

25218244201 is a deficient number, since it is larger than the sum of its proper divisors (1).

25218244201 is an equidigital number, since it uses as much as digits as its factorization.

25218244201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10240, while the sum is 31.

The spelling of 25218244201 in words is "twenty-five billion, two hundred eighteen million, two hundred forty-four thousand, two hundred one".