1669632749 has 2 divisors, whose sum is σ = 1669632750. Its totient is φ = 1669632748.

The previous prime is 1669632739. The next prime is 1669632763. The reversal of 1669632749 is 9472369661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 963667849 + 705964900 = 31043^2 + 26570^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669632749 - 2⁸ = 1669632493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1669632749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669632739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834816374 + 834816375.

It is an arithmetic number, because the mean of its divisors is an integer number (834816375).

Almost surely, 2^1669632749 is an apocalyptic number.

It is an amenable number.

1669632749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669632749 is an equidigital number, since it uses as much as digits as its factorization.

1669632749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 53.

The square root of 1669632749 is about 40861.1398397059. The cubic root of 1669632749 is about 1186.3340205711.

The spelling of 1669632749 in words is "one billion, six hundred sixty-nine million, six hundred thirty-two thousand, seven hundred forty-nine".