1691084908720 has 160 divisors (see below), whose sum is σ = 4239166176000. Its totient is φ = 625433840640.

The previous prime is 1691084908693. The next prime is 1691084908729. The reversal of 1691084908720 is 278094801961.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1691084908729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12397690 + ... + 12533350.

It is an arithmetic number, because the mean of its divisors is an integer number (26494788600).

Almost surely, 2^{1691084908720} is an apocalyptic number.

1691084908720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1691084908720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2119583088000).

1691084908720 is an abundant number, since it is smaller than the sum of its proper divisors (2548081267280).

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

1691084908720 is a wasteful number, since it uses less digits than its factorization.

1691084908720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135891 (or 135885 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 1691084908720 in words is "one trillion, six hundred ninety-one billion, eighty-four million, nine hundred eight thousand, seven hundred twenty".