645236425 has 6 divisors (see below), whose sum is σ = 800093198. Its totient is φ = 516189120.

The previous prime is 645236381. The next prime is 645236443. The reversal of 645236425 is 524632546.

645236425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 207129664 + 438106761 = 14392^2 + 20931^2 .

It is not a de Polignac number, because 645236425 - 2¹⁷ = 645105353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12904704 + ... + 12904753.

Almost surely, 2^645236425 is an apocalyptic number.

It is an amenable number.

645236425 is a deficient number, since it is larger than the sum of its proper divisors (154856773).

645236425 is a wasteful number, since it uses less digits than its factorization.

645236425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25809467 (or 25809462 counting only the distinct ones).

The product of its digits is 172800, while the sum is 37.

The square root of 645236425 is about 25401.5043845832. The cubic root of 645236425 is about 864.1178148847.

The spelling of 645236425 in words is "six hundred forty-five million, two hundred thirty-six thousand, four hundred twenty-five".