683869661 has 2 divisors, whose sum is σ = 683869662. Its totient is φ = 683869660.

The previous prime is 683869643. The next prime is 683869729. The reversal of 683869661 is 166968386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 397244761 + 286624900 = 19931^2 + 16930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-683869661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (683869601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341934830 + 341934831.

It is an arithmetic number, because the mean of its divisors is an integer number (341934831).

Almost surely, 2^683869661 is an apocalyptic number.

It is an amenable number.

683869661 is a deficient number, since it is larger than the sum of its proper divisors (1).

683869661 is an equidigital number, since it uses as much as digits as its factorization.

683869661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 53.

The square root of 683869661 is about 26150.9017244148. The cubic root of 683869661 is about 881.0308430363.

The spelling of 683869661 in words is "six hundred eighty-three million, eight hundred sixty-nine thousand, six hundred sixty-one".