1680785913 has 8 divisors (see below), whose sum is σ = 2241511776. Its totient is φ = 1120292000.

The previous prime is 1680785879. The next prime is 1680785929. The reversal of 1680785913 is 3195870861.

1680785913 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1680785913 - 2⁹ = 1680785401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1680785213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40308 + ... + 70613.

It is an arithmetic number, because the mean of its divisors is an integer number (280188972).

Almost surely, 2^1680785913 is an apocalyptic number.

It is an amenable number.

1680785913 is a deficient number, since it is larger than the sum of its proper divisors (560725863).

1680785913 is a wasteful number, since it uses less digits than its factorization.

1680785913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115975.

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 1680785913 is about 40997.3890997951. The cubic root of 1680785913 is about 1188.9697348894.

The spelling of 1680785913 in words is "one billion, six hundred eighty million, seven hundred eighty-five thousand, nine hundred thirteen".