16886721705 has 32 divisors (see below), whose sum is σ = 31049211648. Its totient is φ = 7676985600.

The previous prime is 16886721689. The next prime is 16886721767. The reversal of 16886721705 is 50712768861.

It is a happy number.

It is not a de Polignac number, because 16886721705 - 2⁴ = 16886721689 is a prime.

It is a super-2 number, since 2×16886721705² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 425266 + ... + 463275.

It is an arithmetic number, because the mean of its divisors is an integer number (970287864).

Almost surely, 2^16886721705 is an apocalyptic number.

16886721705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16886721705 is a deficient number, since it is larger than the sum of its proper divisors (14162489943).

16886721705 is a wasteful number, since it uses less digits than its factorization.

16886721705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888737.

The product of its (nonzero) digits is 1128960, while the sum is 51.

The spelling of 16886721705 in words is "sixteen billion, eight hundred eighty-six million, seven hundred twenty-one thousand, seven hundred five".