1645605325 has 48 divisors (see below), whose sum is σ = 2520560896. Its totient is φ = 1037836800.

The previous prime is 1645605301. The next prime is 1645605349. The reversal of 1645605325 is 5235065461.

It is an interprime number because it is at equal distance from previous prime (1645605301) and next prime (1645605349).

It is not a de Polignac number, because 1645605325 - 2¹⁹ = 1645081037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 710920 + ... + 713230.

Almost surely, 2^1645605325 is an apocalyptic number.

It is an amenable number.

1645605325 is a deficient number, since it is larger than the sum of its proper divisors (874955571).

1645605325 is a wasteful number, since it uses less digits than its factorization.

1645605325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654 (or 2649 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 37.

The square root of 1645605325 is about 40566.0612458247. The cubic root of 1645605325 is about 1180.6157193135.

The spelling of 1645605325 in words is "one billion, six hundred forty-five million, six hundred five thousand, three hundred twenty-five".