1666981076 has 6 divisors (see below), whose sum is σ = 2917216890. Its totient is φ = 833490536.

The previous prime is 1666981067. The next prime is 1666981111. The reversal of 1666981076 is 6701896661.

It can be written as a sum of positive squares in only one way, i.e., 1226820676 + 440160400 = 35026^2 + 20980^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208372631 + ... + 208372638.

It is an arithmetic number, because the mean of its divisors is an integer number (486202815).

Almost surely, 2^1666981076 is an apocalyptic number.

It is an amenable number.

1666981076 is a deficient number, since it is larger than the sum of its proper divisors (1250235814).

1666981076 is a wasteful number, since it uses less digits than its factorization.

1666981076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416745273 (or 416745271 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 1666981076 is about 40828.6795769836. The cubic root of 1666981076 is about 1185.7056515059.

The spelling of 1666981076 in words is "one billion, six hundred sixty-six million, nine hundred eighty-one thousand, seventy-six".