1683720684849 has 32 divisors (see below), whose sum is σ = 2648600248320. Its totient is φ = 931031035200.

The previous prime is 1683720684827. The next prime is 1683720684857. The reversal of 1683720684849 is 9484860273861.

It is a happy number.

It is not a de Polignac number, because 1683720684849 - 2⁵ = 1683720684817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1683720684849.

It is not an unprimeable number, because it can be changed into a prime (1683720684809) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11507944 + ... + 11653334.

It is an arithmetic number, because the mean of its divisors is an integer number (82768757760).

Almost surely, 2^{1683720684849} is an apocalyptic number.

It is an amenable number.

1683720684849 is a deficient number, since it is larger than the sum of its proper divisors (964879563471).

1683720684849 is a wasteful number, since it uses less digits than its factorization.

1683720684849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163221.

The product of its (nonzero) digits is 111476736, while the sum is 66.

The spelling of 1683720684849 in words is "one trillion, six hundred eighty-three billion, seven hundred twenty million, six hundred eighty-four thousand, eight hundred forty-nine".