25421812417 has 4 divisors (see below), whose sum is σ = 25423144020. Its totient is φ = 25420480816.

The previous prime is 25421812397. The next prime is 25421812421. The reversal of 25421812417 is 71421812452.

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 13127659776 + 12294152641 = 114576^2 + 110879^2 .

It is a cyclic number.

It is not a de Polignac number, because 25421812417 - 2¹⁹ = 25421288129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25421812217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636742 + ... + 675487.

It is an arithmetic number, because the mean of its divisors is an integer number (6355786005).

Almost surely, 2^25421812417 is an apocalyptic number.

It is an amenable number.

25421812417 is a deficient number, since it is larger than the sum of its proper divisors (1331603).

25421812417 is a wasteful number, since it uses less digits than its factorization.

25421812417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331602.

The product of its digits is 35840, while the sum is 37.

The spelling of 25421812417 in words is "twenty-five billion, four hundred twenty-one million, eight hundred twelve thousand, four hundred seventeen".