82665661 has 4 divisors (see below), whose sum is σ = 89024572. Its totient is φ = 76306752.

The previous prime is 82665643. The next prime is 82665677. The reversal of 82665661 is 16656628.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45832900 + 36832761 = 6770^2 + 6069^2 .

It is a cyclic number.

It is not a de Polignac number, because 82665661 - 2⁷ = 82665533 is a prime.

It is a super-2 number, since 2×82665661² = 13667223017133842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82665691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3179436 + ... + 3179461.

It is an arithmetic number, because the mean of its divisors is an integer number (22256143).

Almost surely, 2^82665661 is an apocalyptic number.

It is an amenable number.

82665661 is a deficient number, since it is larger than the sum of its proper divisors (6358911).

82665661 is a wasteful number, since it uses less digits than its factorization.

82665661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6358910.

The product of its digits is 103680, while the sum is 40.

The square root of 82665661 is about 9092.0658268625. The cubic root of 82665661 is about 435.6205719699.

The spelling of 82665661 in words is "eighty-two million, six hundred sixty-five thousand, six hundred sixty-one".