25546907506 has 4 divisors (see below), whose sum is σ = 38320361262. Its totient is φ = 12773453752.

The previous prime is 25546907497. The next prime is 25546907513. The reversal of 25546907506 is 60570964552.

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., 22253180625 + 3293726881 = 149175^2 + 57391^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 25546907506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6386726875 + ... + 6386726878.

Almost surely, 2^25546907506 is an apocalyptic number.

25546907506 is a deficient number, since it is larger than the sum of its proper divisors (12773453756).

25546907506 is a wasteful number, since it uses less digits than its factorization.

25546907506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12773453755.

The product of its (nonzero) digits is 2268000, while the sum is 49.

The spelling of 25546907506 in words is "twenty-five billion, five hundred forty-six million, nine hundred seven thousand, five hundred six".