1663538650 has 24 divisors (see below), whose sum is σ = 3107043324. Its totient is φ = 662649600.

The previous prime is 1663538627. The next prime is 1663538671. The reversal of 1663538650 is 568353661.

It can be written as a sum of positive squares in 6 ways, for example, as 1195292329 + 468246321 = 34573^2 + 21639^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1663538597 and 1663538606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56977 + ... + 81076.

Almost surely, 2^1663538650 is an apocalyptic number.

1663538650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1663538650 is a deficient number, since it is larger than the sum of its proper divisors (1443504674).

1663538650 is a wasteful number, since it uses less digits than its factorization.

1663538650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138306 (or 138301 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 43.

The square root of 1663538650 is about 40786.5008305444. The cubic root of 1663538650 is about 1184.8889022113. Note that the first 3 decimals are identical.

The spelling of 1663538650 in words is "one billion, six hundred sixty-three million, five hundred thirty-eight thousand, six hundred fifty".