1663631441 has 4 divisors (see below), whose sum is σ = 1761492132. Its totient is φ = 1565770752.

The previous prime is 1663631419. The next prime is 1663631449. The reversal of 1663631441 is 1441363661.

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 1006221841 + 657409600 = 31721^2 + 25640^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663631441 - 2²² = 1659437137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663631449) 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, 48930320 + ... + 48930353.

It is an arithmetic number, because the mean of its divisors is an integer number (440373033).

Almost surely, 2^1663631441 is an apocalyptic number.

It is an amenable number.

1663631441 is a deficient number, since it is larger than the sum of its proper divisors (97860691).

1663631441 is an equidigital number, since it uses as much as digits as its factorization.

1663631441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97860690.

The product of its digits is 31104, while the sum is 35.

The square root of 1663631441 is about 40787.6383356526. The cubic root of 1663631441 is about 1184.9109325545.

The spelling of 1663631441 in words is "one billion, six hundred sixty-three million, six hundred thirty-one thousand, four hundred forty-one".