1685616949920 has 96 divisors (see below), whose sum is σ = 5480973872640. Its totient is φ = 434997918720.

The previous prime is 1685616949823. The next prime is 1685616949937. The reversal of 1685616949920 is 299496165861.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 56625475 + ... + 56655234.

It is an arithmetic number, because the mean of its divisors is an integer number (57093477840).

Almost surely, 2^{1685616949920} is an apocalyptic number.

1685616949920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685616949920 is an abundant number, since it is smaller than the sum of its proper divisors (3795356922720).

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

1685616949920 is a wasteful number, since it uses less digits than its factorization.

1685616949920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113280758 (or 113280750 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 66.

The spelling of 1685616949920 in words is "one trillion, six hundred eighty-five billion, six hundred sixteen million, nine hundred forty-nine thousand, nine hundred twenty".