25431215434 has 16 divisors (see below), whose sum is σ = 38315137608. Its totient is φ = 12659576832.

The previous prime is 25431215429. The next prime is 25431215449. The reversal of 25431215434 is 43451213452.

It can be written as a sum of positive squares in 4 ways, for example, as 24870236209 + 560979225 = 157703^2 + 23685^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25431215434.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 700842 + ... + 736234.

Almost surely, 2^25431215434 is an apocalyptic number.

25431215434 is a deficient number, since it is larger than the sum of its proper divisors (12883922174).

25431215434 is a wasteful number, since it uses less digits than its factorization.

25431215434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36969.

The product of its digits is 57600, while the sum is 34.

Adding to 25431215434 its reverse (43451213452), we get a palindrome (68882428886).

The spelling of 25431215434 in words is "twenty-five billion, four hundred thirty-one million, two hundred fifteen thousand, four hundred thirty-four".