25242421155305 has 4 divisors (see below), whose sum is σ = 30290905386372. Its totient is φ = 20193936924240.

The previous prime is 25242421155197. The next prime is 25242421155349. The reversal of 25242421155305 is 50355112424252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5746778795536 + 19495642359769 = 2397244^2 + 4415387^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25242421155305 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2524242115526 + ... + 2524242115535.

It is an arithmetic number, because the mean of its divisors is an integer number (7572726346593).

Almost surely, 2^{25242421155305} is an apocalyptic number.

It is an amenable number.

25242421155305 is a deficient number, since it is larger than the sum of its proper divisors (5048484231067).

25242421155305 is an equidigital number, since it uses as much as digits as its factorization.

25242421155305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5048484231066.

The product of its (nonzero) digits is 480000, while the sum is 41.

Adding to 25242421155305 its reverse (50355112424252), we get a palindrome (75597533579557).

The spelling of 25242421155305 in words is "twenty-five trillion, two hundred forty-two billion, four hundred twenty-one million, one hundred fifty-five thousand, three hundred five".