1645205152 has 12 divisors (see below), whose sum is σ = 3238997706. Its totient is φ = 822602560.

The previous prime is 1645205137. The next prime is 1645205173. The reversal of 1645205152 is 2515025461.

It can be written as a sum of positive squares in only one way, i.e., 1287087376 + 358117776 = 35876^2 + 18924^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25706299 + ... + 25706362.

Almost surely, 2^1645205152 is an apocalyptic number.

It is an amenable number.

1645205152 is a deficient number, since it is larger than the sum of its proper divisors (1593792554).

1645205152 is an equidigital number, since it uses as much as digits as its factorization.

1645205152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51412671 (or 51412663 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 1645205152 is about 40561.1285839041. The cubic root of 1645205152 is about 1180.5200121131.

The spelling of 1645205152 in words is "one billion, six hundred forty-five million, two hundred five thousand, one hundred fifty-two".