1663985051 has 2 divisors, whose sum is σ = 1663985052. Its totient is φ = 1663985050.

The previous prime is 1663985033. The next prime is 1663985093. The reversal of 1663985051 is 1505893661.

It is a weak prime.

It is an emirp because it is prime and its reverse (1505893661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1663985051 - 2²⁶ = 1596876187 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1663984993 and 1663985011.

It is not a weakly prime, because it can be changed into another prime (1663925051) by changing a digit.

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 as a sum of consecutive naturals, namely, 831992525 + 831992526.

It is an arithmetic number, because the mean of its divisors is an integer number (831992526).

Almost surely, 2^1663985051 is an apocalyptic number.

1663985051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663985051 is an equidigital number, since it uses as much as digits as its factorization.

1663985051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 1663985051 is about 40791.9728745742. The cubic root of 1663985051 is about 1184.9948787663.

The spelling of 1663985051 in words is "one billion, six hundred sixty-three million, nine hundred eighty-five thousand, fifty-one".