25218681233 has 2 divisors, whose sum is σ = 25218681234. Its totient is φ = 25218681232.

The previous prime is 25218681217. The next prime is 25218681253. The reversal of 25218681233 is 33218681252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14870095249 + 10348585984 = 121943^2 + 101728^2 .

It is a cyclic number.

It is not a de Polignac number, because 25218681233 - 2⁴ = 25218681217 is a prime.

It is not a weakly prime, because it can be changed into another prime (25218681253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12609340616 + 12609340617.

It is an arithmetic number, because the mean of its divisors is an integer number (12609340617).

Almost surely, 2^25218681233 is an apocalyptic number.

It is an amenable number.

25218681233 is a deficient number, since it is larger than the sum of its proper divisors (1).

25218681233 is an equidigital number, since it uses as much as digits as its factorization.

25218681233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 41.

The spelling of 25218681233 in words is "twenty-five billion, two hundred eighteen million, six hundred eighty-one thousand, two hundred thirty-three".