82665561 has 32 divisors (see below), whose sum is σ = 130682880. Its totient is φ = 45921600.

The previous prime is 82665547. The next prime is 82665563. The reversal of 82665561 is 16556628.

It is not a de Polignac number, because 82665561 - 2⁶ = 82665497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82665563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17311 + ... + 21563.

It is an arithmetic number, because the mean of its divisors is an integer number (4083840).

Almost surely, 2^82665561 is an apocalyptic number.

It is an amenable number.

82665561 is a deficient number, since it is larger than the sum of its proper divisors (48017319).

82665561 is a wasteful number, since it uses less digits than its factorization.

82665561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4317.

The product of its digits is 86400, while the sum is 39.

The square root of 82665561 is about 9092.0603275605. The cubic root of 82665561 is about 435.6203963143.

The spelling of 82665561 in words is "eighty-two million, six hundred sixty-five thousand, five hundred sixty-one".