1663600625 has 20 divisors (see below), whose sum is σ = 2129571444. Its totient is φ = 1298400000.

The previous prime is 1663600607. The next prime is 1663600633. The reversal of 1663600625 is 5260063661.

It can be written as a sum of positive squares in 10 ways, for example, as 1651040689 + 12559936 = 40633^2 + 3544^2 .

It is not a de Polignac number, because 1663600625 - 2¹⁰ = 1663599601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6836 + ... + 58085.

Almost surely, 2^1663600625 is an apocalyptic number.

It is an amenable number.

1663600625 is a deficient number, since it is larger than the sum of its proper divisors (465970819).

1663600625 is an frugal number, since it uses more digits than its factorization.

1663600625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64982 (or 64967 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 1663600625 is about 40787.2605723895. The cubic root of 1663600625 is about 1184.9036163425.

It can be divided in two parts, 16 and 63600625, that multiplied together give a square (1017610000 = 31900²).

The spelling of 1663600625 in words is "one billion, six hundred sixty-three million, six hundred thousand, six hundred twenty-five".