16143061991 has 8 divisors (see below), whose sum is σ = 18656508960. Its totient is φ = 13681438848.

The previous prime is 16143061951. The next prime is 16143061993. The reversal of 16143061991 is 19916034161.

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 16143061991 - 2¹⁸ = 16142799847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16143061993) 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, 12955286 + ... + 12956531.

It is an arithmetic number, because the mean of its divisors is an integer number (2332063620).

Almost surely, 2^16143061991 is an apocalyptic number.

16143061991 is a deficient number, since it is larger than the sum of its proper divisors (2513446969).

16143061991 is an equidigital number, since it uses as much as digits as its factorization.

16143061991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25911913.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 16143061991 in words is "sixteen billion, one hundred forty-three million, sixty-one thousand, nine hundred ninety-one".