1966809653 has 2 divisors, whose sum is σ = 1966809654. Its totient is φ = 1966809652.

The previous prime is 1966809599. The next prime is 1966809659. The reversal of 1966809653 is 3569086691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1949487409 + 17322244 = 44153^2 + 4162^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966809653 - 2¹² = 1966805557 is a prime.

It is a super-2 number, since 2×1966809653² = 7736680422267960818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1966809595 and 1966809604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1966809659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983404826 + 983404827.

It is an arithmetic number, because the mean of its divisors is an integer number (983404827).

Almost surely, 2^1966809653 is an apocalyptic number.

It is an amenable number.

1966809653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966809653 is an equidigital number, since it uses as much as digits as its factorization.

1966809653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 1966809653 is about 44348.7277495082. The cubic root of 1966809653 is about 1252.9126007743.

The spelling of 1966809653 in words is "one billion, nine hundred sixty-six million, eight hundred nine thousand, six hundred fifty-three".