1668701843 has 2 divisors, whose sum is σ = 1668701844. Its totient is φ = 1668701842.

The previous prime is 1668701737. The next prime is 1668701891. The reversal of 1668701843 is 3481078661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668701843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1668701794 and 1668701803.

It is not a weakly prime, because it can be changed into another prime (1668700843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834350921 + 834350922.

It is an arithmetic number, because the mean of its divisors is an integer number (834350922).

Almost surely, 2^1668701843 is an apocalyptic number.

1668701843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668701843 is an equidigital number, since it uses as much as digits as its factorization.

1668701843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 1668701843 is about 40849.7471595602. The cubic root of 1668701843 is about 1186.1134988688.

The spelling of 1668701843 in words is "one billion, six hundred sixty-eight million, seven hundred one thousand, eight hundred forty-three".