16686120721282 has 16 divisors (see below), whose sum is σ = 25289526641400. Its totient is φ = 8256294240768.

The previous prime is 16686120721279. The next prime is 16686120721367. The reversal of 16686120721282 is 28212702168661.

It can be written as a sum of positive squares in 4 ways, for example, as 4539494710881 + 12146626010401 = 2130609^2 + 3485201^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1803693 + ... + 6051904.

Almost surely, 2^{16686120721282} is an apocalyptic number.

16686120721282 is a deficient number, since it is larger than the sum of its proper divisors (8603405920118).

16686120721282 is a wasteful number, since it uses less digits than its factorization.

16686120721282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7866645.

The product of its (nonzero) digits is 1548288, while the sum is 52.

The spelling of 16686120721282 in words is "sixteen trillion, six hundred eighty-six billion, one hundred twenty million, seven hundred twenty-one thousand, two hundred eighty-two".