1681076066 has 4 divisors (see below), whose sum is σ = 2521614102. Its totient is φ = 840538032.

The previous prime is 1681076051. The next prime is 1681076069. The reversal of 1681076066 is 6606701861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1642275625 + 38800441 = 40525^2 + 6229^2 .

It is not an unprimeable number, because it can be changed into a prime (1681076069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420269015 + ... + 420269018.

Almost surely, 2^1681076066 is an apocalyptic number.

1681076066 is a deficient number, since it is larger than the sum of its proper divisors (840538036).

1681076066 is an equidigital number, since it uses as much as digits as its factorization.

1681076066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840538035.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1681076066 is about 41000.9276236526. The cubic root of 1681076066 is about 1189.0381479818.

The spelling of 1681076066 in words is "one billion, six hundred eighty-one million, seventy-six thousand, sixty-six".