1636320425 has 12 divisors (see below), whose sum is σ = 2062302156. Its totient is φ = 1287595200.

The previous prime is 1636320421. The next prime is 1636320437. The reversal of 1636320425 is 5240236361.

1636320425 = 28603² + 28604².

It can be written as a sum of positive squares in 6 ways, for example, as 818188816 + 818131609 = 28604^2 + 28603^2 .

It is not a de Polignac number, because 1636320425 - 2² = 1636320421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1636320391 and 1636320400.

It is not an unprimeable number, because it can be changed into a prime (1636320421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 534974 + ... + 538023.

It is an arithmetic number, because the mean of its divisors is an integer number (171858513).

Almost surely, 2^1636320425 is an apocalyptic number.

1636320425 is the 28604-th centered square number.

It is an amenable number.

1636320425 is a deficient number, since it is larger than the sum of its proper divisors (425981731).

1636320425 is a wasteful number, since it uses less digits than its factorization.

1636320425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073068 (or 1073063 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 1636320425 is about 40451.4576375191. The cubic root of 1636320425 is about 1178.3910910570.

Adding to 1636320425 its reverse (5240236361), we get a palindrome (6876556786).

The spelling of 1636320425 in words is "one billion, six hundred thirty-six million, three hundred twenty thousand, four hundred twenty-five".