1691503668036 has 432 divisors, whose sum is σ = 5586135318400. Its totient is φ = 421577395200.

The previous prime is 1691503667989. The next prime is 1691503668053. The reversal of 1691503668036 is 6308663051961.

1691503668036 is a `hidden beast` number, since 16 + 91 + 503 + 6 + 6 + 8 + 0 + 36 = 666.

It is a super-2 number, since 2×1691503668036² (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 143 ways as a sum of consecutive naturals, for example, 4218213436 + ... + 4218213836.

Almost surely, 2^{1691503668036} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1691503668036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2793067659200).

1691503668036 is an abundant number, since it is smaller than the sum of its proper divisors (3894631650364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1691503668036 is a wasteful number, since it uses less digits than its factorization.

1691503668036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 1691503668036 in words is "one trillion, six hundred ninety-one billion, five hundred three million, six hundred sixty-eight thousand, thirty-six".