1651666589 has 2 divisors, whose sum is σ = 1651666590. Its totient is φ = 1651666588.

The previous prime is 1651666567. The next prime is 1651666649. The reversal of 1651666589 is 9856661561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1634584900 + 17081689 = 40430^2 + 4133^2 .

It is an emirp because it is prime and its reverse (9856661561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1651666589 - 2¹⁶ = 1651601053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1651666589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1651666529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825833294 + 825833295.

It is an arithmetic number, because the mean of its divisors is an integer number (825833295).

Almost surely, 2^1651666589 is an apocalyptic number.

It is an amenable number.

1651666589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651666589 is an equidigital number, since it uses as much as digits as its factorization.

1651666589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2332800, while the sum is 53.

The square root of 1651666589 is about 40640.7011381448. The cubic root of 1651666589 is about 1182.0634653085.

The spelling of 1651666589 in words is "one billion, six hundred fifty-one million, six hundred sixty-six thousand, five hundred eighty-nine".