1689390078763 has 2 divisors, whose sum is σ = 1689390078764. Its totient is φ = 1689390078762.

The previous prime is 1689390078751. The next prime is 1689390078797. The reversal of 1689390078763 is 3678700939861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1689390078763 - 2³³ = 1680800144171 is a prime.

It is a super-2 number, since 2×1689390078763² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1689390078713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844695039381 + 844695039382.

It is an arithmetic number, because the mean of its divisors is an integer number (844695039382).

Almost surely, 2^{1689390078763} is an apocalyptic number.

1689390078763 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689390078763 is an equidigital number, since it uses as much as digits as its factorization.

1689390078763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82301184, while the sum is 67.

The spelling of 1689390078763 in words is "one trillion, six hundred eighty-nine billion, three hundred ninety million, seventy-eight thousand, seven hundred sixty-three".