25405432431 has 8 divisors (see below), whose sum is σ = 33910773120. Its totient is φ = 16918523352.

The previous prime is 25405432379. The next prime is 25405432441. The reversal of 25405432431 is 13423450452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-25405432431 is a prime.

It is a super-2 number, since 2×25405432431² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25405432392 and 25405432401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25405432441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4604685 + ... + 4610198.

It is an arithmetic number, because the mean of its divisors is an integer number (4238846640).

Almost surely, 2^25405432431 is an apocalyptic number.

25405432431 is a deficient number, since it is larger than the sum of its proper divisors (8505340689).

25405432431 is an equidigital number, since it uses as much as digits as its factorization.

25405432431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9215805.

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 25405432431 its reverse (13423450452), we get a palindrome (38828882883).

The spelling of 25405432431 in words is "twenty-five billion, four hundred five million, four hundred thirty-two thousand, four hundred thirty-one".