1688808969616 has 20 divisors (see below), whose sum is σ = 3272131035612. Its totient is φ = 844388057216.

The previous prime is 1688808969583. The next prime is 1688808969623. The reversal of 1688808969616 is 6169698088861.

It can be written as a sum of positive squares in 2 ways, for example, as 1237869859216 + 450939110400 = 1112596^2 + 671520^2 .

It is a super-2 number, since 2×1688808969616² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156235 + ... + 1844458.

Almost surely, 2^{1688808969616} is an apocalyptic number.

1688808969616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1688808969616 is a deficient number, since it is larger than the sum of its proper divisors (1583322065996).

1688808969616 is a wasteful number, since it uses less digits than its factorization.

1688808969616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053458 (or 2053452 counting only the distinct ones).

The product of its (nonzero) digits is 429981696, while the sum is 76.

The spelling of 1688808969616 in words is "one trillion, six hundred eighty-eight billion, eight hundred eight million, nine hundred sixty-nine thousand, six hundred sixteen".