16689829981 has 8 divisors (see below), whose sum is σ = 18217530144. Its totient is φ = 15163870320.

The previous prime is 16689829967. The next prime is 16689830011. The reversal of 16689829981 is 18992898661.

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 16689829981 - 2⁷ = 16689829853 is a prime.

It is a super-2 number, since 2×16689829981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16689829901) 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, 415030 + ... + 453463.

It is an arithmetic number, because the mean of its divisors is an integer number (2277191268).

Almost surely, 2^16689829981 is an apocalyptic number.

16689829981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16689829981 is a deficient number, since it is larger than the sum of its proper divisors (1527700163).

16689829981 is a wasteful number, since it uses less digits than its factorization.

16689829981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870251.

The product of its digits is 26873856, while the sum is 67.

The spelling of 16689829981 in words is "sixteen billion, six hundred eighty-nine million, eight hundred twenty-nine thousand, nine hundred eighty-one".