1641663369 has 20 divisors (see below), whose sum is σ = 2458265040. Its totient is φ = 1091807640.

The previous prime is 1641663343. The next prime is 1641663383. The reversal of 1641663369 is 9633661461.

1641663369 is a `hidden beast` number, since 1 + 6 + 4 + 1 + 6 + 633 + 6 + 9 = 666.

It is not a de Polignac number, because 1641663369 - 2⁸ = 1641663113 is a prime.

It is a super-2 number, since 2×1641663369² = 5390117234232860322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1641663389) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9754 + ... + 58124.

It is an arithmetic number, because the mean of its divisors is an integer number (122913252).

Almost surely, 2^1641663369 is an apocalyptic number.

It is an amenable number.

1641663369 is a deficient number, since it is larger than the sum of its proper divisors (816601671).

1641663369 is an equidigital number, since it uses as much as digits as its factorization.

1641663369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48802 (or 48793 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 1641663369 is about 40517.4452427593. The cubic root of 1641663369 is about 1179.6722658252.

The spelling of 1641663369 in words is "one billion, six hundred forty-one million, six hundred sixty-three thousand, three hundred sixty-nine".