25402106434 has 4 divisors (see below), whose sum is σ = 38103159654. Its totient is φ = 12701053216.

The previous prime is 25402106383. The next prime is 25402106447. The reversal of 25402106434 is 43460120452.

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

It can be written as a sum of positive squares in only one way, i.e., 22354735225 + 3047371209 = 149515^2 + 55203^2 .

It is a super-2 number, since 2×25402106434² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 25402106396 and 25402106405.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6350526607 + ... + 6350526610.

Almost surely, 2^25402106434 is an apocalyptic number.

25402106434 is a deficient number, since it is larger than the sum of its proper divisors (12701053220).

25402106434 is a wasteful number, since it uses less digits than its factorization.

25402106434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12701053219.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 25402106434 its reverse (43460120452), we get a palindrome (68862226886).

The spelling of 25402106434 in words is "twenty-five billion, four hundred two million, one hundred six thousand, four hundred thirty-four".