16688890585989 has 24 divisors (see below), whose sum is σ = 24124414178592. Its totient is φ = 11117509996320.

The previous prime is 16688890585889. The next prime is 16688890586009. The reversal of 16688890585989 is 98958509888661.

16688890585989 is a `hidden beast` number, since 1 + 6 + 6 + 8 + 8 + 8 + 9 + 0 + 5 + 8 + 598 + 9 = 666.

It is not a de Polignac number, because 16688890585989 - 2²¹ = 16688888488837 is a prime.

It is a super-2 number, since 2×16688890585989² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16688890585899 and 16688890585908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16688890585889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 416234427 + ... + 416274519.

It is an arithmetic number, because the mean of its divisors is an integer number (1005183924108).

Almost surely, 2^{16688890585989} is an apocalyptic number.

It is an amenable number.

16688890585989 is a deficient number, since it is larger than the sum of its proper divisors (7435523592603).

16688890585989 is a wasteful number, since it uses less digits than its factorization.

16688890585989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73937 (or 73934 counting only the distinct ones).

The product of its (nonzero) digits is 21499084800, while the sum is 90.

The spelling of 16688890585989 in words is "sixteen trillion, six hundred eighty-eight billion, eight hundred ninety million, five hundred eighty-five thousand, nine hundred eighty-nine".