1663413691 has 8 divisors (see below), whose sum is σ = 1751444480. Its totient is φ = 1575431208.

The previous prime is 1663413679. The next prime is 1663413701. The reversal of 1663413691 is 1963143661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1663413691 - 2⁹ = 1663413179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663413611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74650 + ... + 94336.

It is an arithmetic number, because the mean of its divisors is an integer number (218930560).

Almost surely, 2^1663413691 is an apocalyptic number.

1663413691 is a deficient number, since it is larger than the sum of its proper divisors (88030789).

1663413691 is a wasteful number, since it uses less digits than its factorization.

1663413691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24153.

The product of its digits is 69984, while the sum is 40.

The square root of 1663413691 is about 40784.9689346455. The cubic root of 1663413691 is about 1184.8592332804.

The spelling of 1663413691 in words is "one billion, six hundred sixty-three million, four hundred thirteen thousand, six hundred ninety-one".