1643132025 has 72 divisors (see below), whose sum is σ = 3223822680. Its totient is φ = 796293120.

The previous prime is 1643132017. The next prime is 1643132041. The reversal of 1643132025 is 5202313461.

1643132025 is a `hidden beast` number, since 1 + 643 + 13 + 2 + 0 + 2 + 5 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 348643584 + 1294488441 = 18672^2 + 35979^2 .

It is not a de Polignac number, because 1643132025 - 2³ = 1643132017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1643132025.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 103519 + ... + 118331.

It is an arithmetic number, because the mean of its divisors is an integer number (44775315).

Almost surely, 2^1643132025 is an apocalyptic number.

1643132025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1643132025 is a deficient number, since it is larger than the sum of its proper divisors (1580690655).

1643132025 is a wasteful number, since it uses less digits than its factorization.

1643132025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14875 (or 14867 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1643132025 is about 40535.5649399389. The cubic root of 1643132025 is about 1180.0239449800.

Adding to 1643132025 its reverse (5202313461), we get a palindrome (6845445486).

The spelling of 1643132025 in words is "one billion, six hundred forty-three million, one hundred thirty-two thousand, twenty-five".