16881499749 has 32 divisors (see below), whose sum is σ = 24669360000. Its totient is φ = 10220908544.

The previous prime is 16881499693. The next prime is 16881499757. The reversal of 16881499749 is 94799418861.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16881499749 - 2⁹ = 16881499237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16881499749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16881499759) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4167277 + ... + 4171325.

It is an arithmetic number, because the mean of its divisors is an integer number (770917500).

Almost surely, 2^16881499749 is an apocalyptic number.

It is an amenable number.

16881499749 is a deficient number, since it is larger than the sum of its proper divisors (7787860251).

16881499749 is a wasteful number, since it uses less digits than its factorization.

16881499749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6917.

The product of its digits is 31352832, while the sum is 66.

The spelling of 16881499749 in words is "sixteen billion, eight hundred eighty-one million, four hundred ninety-nine thousand, seven hundred forty-nine".