25128406645 has 8 divisors (see below), whose sum is σ = 30155429304. Its totient is φ = 20101831104.

The previous prime is 25128406643. The next prime is 25128406651. The reversal of 25128406645 is 54660482152.

It can be written as a sum of positive squares in 4 ways, for example, as 4889645476 + 20238761169 = 69926^2 + 142263^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25128406645 - 2¹ = 25128406643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25128406643) by changing a digit.

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, 27687 + ... + 225883.

It is an arithmetic number, because the mean of its divisors is an integer number (3769428663).

Almost surely, 2^25128406645 is an apocalyptic number.

It is an amenable number.

25128406645 is a deficient number, since it is larger than the sum of its proper divisors (5027022659).

25128406645 is a wasteful number, since it uses less digits than its factorization.

25128406645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223559.

The product of its (nonzero) digits is 460800, while the sum is 43.

Adding to 25128406645 its reverse (54660482152), we get a palindrome (79788888797).

The spelling of 25128406645 in words is "twenty-five billion, one hundred twenty-eight million, four hundred six thousand, six hundred forty-five".