1669375861 has 2 divisors, whose sum is σ = 1669375862. Its totient is φ = 1669375860.

The previous prime is 1669375849. The next prime is 1669375867. The reversal of 1669375861 is 1685739661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1004509636 + 664866225 = 31694^2 + 25785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669375861 - 2⁷ = 1669375733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1669375799 and 1669375808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669375867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834687930 + 834687931.

It is an arithmetic number, because the mean of its divisors is an integer number (834687931).

Almost surely, 2^1669375861 is an apocalyptic number.

It is an amenable number.

1669375861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669375861 is an equidigital number, since it uses as much as digits as its factorization.

1669375861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 52.

The square root of 1669375861 is about 40857.9962920357. The cubic root of 1669375861 is about 1186.2731747343.

The spelling of 1669375861 in words is "one billion, six hundred sixty-nine million, three hundred seventy-five thousand, eight hundred sixty-one".