1663688125 has 40 divisors (see below), whose sum is σ = 2294265600. Its totient is φ = 1195920000.

The previous prime is 1663688111. The next prime is 1663688137. The reversal of 1663688125 is 5218863661.

It is not a de Polignac number, because 1663688125 - 2⁷ = 1663687997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 610516 + ... + 613234.

It is an arithmetic number, because the mean of its divisors is an integer number (57356640).

Almost surely, 2^1663688125 is an apocalyptic number.

It is an amenable number.

1663688125 is a deficient number, since it is larger than the sum of its proper divisors (630577475).

1663688125 is an equidigital number, since it uses as much as digits as its factorization.

1663688125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2839 (or 2824 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 1663688125 is about 40788.3331971288. Note that the first 3 decimals coincide. The cubic root of 1663688125 is about 1184.9243900080.

The spelling of 1663688125 in words is "one billion, six hundred sixty-three million, six hundred eighty-eight thousand, one hundred twenty-five".