25420343555 has 4 divisors (see below), whose sum is σ = 30504412272. Its totient is φ = 20336274840.

The previous prime is 25420343537. The next prime is 25420343591. The reversal of 25420343555 is 55534302452.

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

It is not a de Polignac number, because 25420343555 - 2²⁶ = 25353234691 is a prime.

It is a Duffinian 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, 2542034351 + ... + 2542034360.

It is an arithmetic number, because the mean of its divisors is an integer number (7626103068).

Almost surely, 2^25420343555 is an apocalyptic number.

25420343555 is a deficient number, since it is larger than the sum of its proper divisors (5084068717).

25420343555 is an equidigital number, since it uses as much as digits as its factorization.

25420343555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5084068716.

The product of its (nonzero) digits is 360000, while the sum is 38.

The spelling of 25420343555 in words is "twenty-five billion, four hundred twenty million, three hundred forty-three thousand, five hundred fifty-five".