25430550243 has 32 divisors (see below), whose sum is σ = 39778636800. Its totient is φ = 14147965440.

The previous prime is 25430550241. The next prime is 25430550263. The reversal of 25430550243 is 34205503452.

It is a happy number.

It is not a de Polignac number, because 25430550243 - 2¹ = 25430550241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25430550241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 388983 + ... + 449631.

It is an arithmetic number, because the mean of its divisors is an integer number (1243082400).

Almost surely, 2^25430550243 is an apocalyptic number.

25430550243 is a deficient number, since it is larger than the sum of its proper divisors (14348086557).

25430550243 is a wasteful number, since it uses less digits than its factorization.

25430550243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61187.

The product of its (nonzero) digits is 72000, while the sum is 33.

The spelling of 25430550243 in words is "twenty-five billion, four hundred thirty million, five hundred fifty thousand, two hundred forty-three".