1663381145 has 4 divisors (see below), whose sum is σ = 1996057380. Its totient is φ = 1330704912.

The previous prime is 1663381127. The next prime is 1663381147. The reversal of 1663381145 is 5411833661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 557951641 + 1105429504 = 23621^2 + 33248^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663381145 - 2²⁸ = 1394945689 is a prime.

It is a super-2 number, since 2×1663381145² = 5533673667083022050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1663381099 and 1663381108.

It is not an unprimeable number, because it can be changed into a prime (1663381147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166338110 + ... + 166338119.

It is an arithmetic number, because the mean of its divisors is an integer number (499014345).

Almost surely, 2^1663381145 is an apocalyptic number.

It is an amenable number.

1663381145 is a deficient number, since it is larger than the sum of its proper divisors (332676235).

1663381145 is an equidigital number, since it uses as much as digits as its factorization.

1663381145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332676234.

The product of its digits is 51840, while the sum is 38.

The square root of 1663381145 is about 40784.5699376615. The cubic root of 1663381145 is about 1184.8515056617.

The spelling of 1663381145 in words is "one billion, six hundred sixty-three million, three hundred eighty-one thousand, one hundred forty-five".