1688400166850 has 12 divisors (see below), whose sum is σ = 3140424310434. Its totient is φ = 675360066720.

The previous prime is 1688400166847. The next prime is 1688400166877. The reversal of 1688400166850 is 586610048861.

It can be written as a sum of positive squares in 3 ways, for example, as 1077778261921 + 610621904929 = 1038161^2 + 781423^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1688400166792 and 1688400166801.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16884001619 + ... + 16884001718.

Almost surely, 2^{1688400166850} is an apocalyptic number.

1688400166850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1688400166850 is a deficient number, since it is larger than the sum of its proper divisors (1452024143584).

1688400166850 is a wasteful number, since it uses less digits than its factorization.

1688400166850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33768003349 (or 33768003344 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 53.

The spelling of 1688400166850 in words is "one trillion, six hundred eighty-eight billion, four hundred million, one hundred sixty-six thousand, eight hundred fifty".