1999680611 has 4 divisors (see below), whose sum is σ = 2009831472. Its totient is φ = 1989529752.

The previous prime is 1999680509. The next prime is 1999680629. The reversal of 1999680611 is 1160869991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999680611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1999680611.

It is not an unprimeable number, because it can be changed into a prime (1999680671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5075135 + ... + 5075528.

It is an arithmetic number, because the mean of its divisors is an integer number (502457868).

Almost surely, 2^1999680611 is an apocalyptic number.

1999680611 is a deficient number, since it is larger than the sum of its proper divisors (10150861).

1999680611 is a wasteful number, since it uses less digits than its factorization.

1999680611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10150860.

The product of its (nonzero) digits is 209952, while the sum is 50.

The square root of 1999680611 is about 44717.7885298457. The cubic root of 1999680611 is about 1259.8539788371.

The spelling of 1999680611 in words is "one billion, nine hundred ninety-nine million, six hundred eighty thousand, six hundred eleven".