16663582691 has 8 divisors (see below), whose sum is σ = 19047813120. Its totient is φ = 14280281928.

The previous prime is 16663582687. The next prime is 16663582693. The reversal of 16663582691 is 19628536661.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 16663582691 - 2² = 16663582687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16663582693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193571 + ... + 266076.

It is an arithmetic number, because the mean of its divisors is an integer number (2380976640).

Almost surely, 2^16663582691 is an apocalyptic number.

16663582691 is a deficient number, since it is larger than the sum of its proper divisors (2384230429).

16663582691 is an equidigital number, since it uses as much as digits as its factorization.

16663582691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464833.

The product of its digits is 2799360, while the sum is 53.

The spelling of 16663582691 in words is "sixteen billion, six hundred sixty-three million, five hundred eighty-two thousand, six hundred ninety-one".