25561800419 has 4 divisors (see below), whose sum is σ = 25567950720. Its totient is φ = 25555650120.

The previous prime is 25561800401. The next prime is 25561800443. The reversal of 25561800419 is 91400816552.

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

It is a cyclic number.

It is not a de Polignac number, because 25561800419 - 2²⁸ = 25293364963 is a prime.

It is a super-2 number, since 2×25561800419² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25561800469) 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, 3068912 + ... + 3077229.

It is an arithmetic number, because the mean of its divisors is an integer number (6391987680).

Almost surely, 2^25561800419 is an apocalyptic number.

25561800419 is a deficient number, since it is larger than the sum of its proper divisors (6150301).

25561800419 is an equidigital number, since it uses as much as digits as its factorization.

25561800419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6150300.

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 25561800419 in words is "twenty-five billion, five hundred sixty-one million, eight hundred thousand, four hundred nineteen".