1966838066 has 4 divisors (see below), whose sum is σ = 2950257102. Its totient is φ = 983419032.

The previous prime is 1966838047. The next prime is 1966838099. The reversal of 1966838066 is 6608386691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6608386691 = 173 ⋅38198767.

It can be written as a sum of positive squares in only one way, i.e., 1185356041 + 781482025 = 34429^2 + 27955^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1966837999 and 1966838017.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 491709515 + ... + 491709518.

Almost surely, 2^1966838066 is an apocalyptic number.

1966838066 is a deficient number, since it is larger than the sum of its proper divisors (983419036).

1966838066 is an equidigital number, since it uses as much as digits as its factorization.

1966838066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983419035.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The square root of 1966838066 is about 44349.0480844854. The cubic root of 1966838066 is about 1252.9186340364.

The spelling of 1966838066 in words is "one billion, nine hundred sixty-six million, eight hundred thirty-eight thousand, sixty-six".