1688590643 has 2 divisors, whose sum is σ = 1688590644. Its totient is φ = 1688590642.

The previous prime is 1688590621. The next prime is 1688590661. The reversal of 1688590643 is 3460958861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1688590643 - 2¹⁰ = 1688589619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1688590591 and 1688590600.

It is not a weakly prime, because it can be changed into another prime (1688590663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844295321 + 844295322.

It is an arithmetic number, because the mean of its divisors is an integer number (844295322).

Almost surely, 2^1688590643 is an apocalyptic number.

1688590643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688590643 is an equidigital number, since it uses as much as digits as its factorization.

1688590643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The square root of 1688590643 is about 41092.4645525186. The cubic root of 1688590643 is about 1190.8072208277.

The spelling of 1688590643 in words is "one billion, six hundred eighty-eight million, five hundred ninety thousand, six hundred forty-three".