82061666 has 4 divisors (see below), whose sum is σ = 123092502. Its totient is φ = 41030832.

The previous prime is 82061663. The next prime is 82061687. The reversal of 82061666 is 66616028.

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., 70644025 + 11417641 = 8405^2 + 3379^2 .

It is not an unprimeable number, because it can be changed into a prime (82061663) 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, 20515415 + ... + 20515418.

Almost surely, 2^82061666 is an apocalyptic number.

82061666 is a deficient number, since it is larger than the sum of its proper divisors (41030836).

82061666 is a wasteful number, since it uses less digits than its factorization.

82061666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41030835.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 82061666 is about 9058.7894334729. The cubic root of 82061666 is about 434.5570264898.

The spelling of 82061666 in words is "eighty-two million, sixty-one thousand, six hundred sixty-six".