83780666 has 4 divisors (see below), whose sum is σ = 125671002. Its totient is φ = 41890332.

The previous prime is 83780663. The next prime is 83780699. The reversal of 83780666 is 66608738.

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., 77880625 + 5900041 = 8825^2 + 2429^2 .

It is not an unprimeable number, because it can be changed into a prime (83780663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20945165 + ... + 20945168.

Almost surely, 2^83780666 is an apocalyptic number.

83780666 is a deficient number, since it is larger than the sum of its proper divisors (41890336).

83780666 is a wasteful number, since it uses less digits than its factorization.

83780666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41890335.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 83780666 is about 9153.1779180785. The cubic root of 83780666 is about 437.5704002084.

The spelling of 83780666 in words is "eighty-three million, seven hundred eighty thousand, six hundred sixty-six".