1691290148568 has 128 divisors (see below), whose sum is σ = 4427782963200. Its totient is φ = 537687964800.

The previous prime is 1691290148557. The next prime is 1691290148593. The reversal of 1691290148568 is 8658410921961.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 200885463 + ... + 200893881.

It is an arithmetic number, because the mean of its divisors is an integer number (34592054400).

Almost surely, 2^{1691290148568} 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 1691290148568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2213891481600).

1691290148568 is an abundant number, since it is smaller than the sum of its proper divisors (2736492814632).

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

1691290148568 is a wasteful number, since it uses less digits than its factorization.

1691290148568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12333 (or 12329 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 60.

The spelling of 1691290148568 in words is "one trillion, six hundred ninety-one billion, two hundred ninety million, one hundred forty-eight thousand, five hundred sixty-eight".