1671708866 has 4 divisors (see below), whose sum is σ = 2507563302. Its totient is φ = 835854432.

The previous prime is 1671708859. The next prime is 1671708869. The reversal of 1671708866 is 6688071761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6688071761 = 7 ⋅955438823.

It can be written as a sum of positive squares in only one way, i.e., 1671092641 + 616225 = 40879^2 + 785^2 .

It is a super-2 number, since 2×1671708866² = 5589221065326011912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1671708869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 417927215 + ... + 417927218.

Almost surely, 2^1671708866 is an apocalyptic number.

1671708866 is a deficient number, since it is larger than the sum of its proper divisors (835854436).

1671708866 is an equidigital number, since it uses as much as digits as its factorization.

1671708866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835854435.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 1671708866 is about 40886.5364881889. The cubic root of 1671708866 is about 1186.8255354603.

The spelling of 1671708866 in words is "one billion, six hundred seventy-one million, seven hundred eight thousand, eight hundred sixty-six".