82566641 has 4 divisors (see below), whose sum is σ = 82605300. Its totient is φ = 82527984.

The previous prime is 82566629. The next prime is 82566643. The reversal of 82566641 is 14666528.

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 42510400 + 40056241 = 6520^2 + 6329^2 .

It is a cyclic number.

It is not a de Polignac number, because 82566641 - 2¹⁴ = 82550257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82566595 and 82566604.

It is not an unprimeable number, because it can be changed into a prime (82566643) 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, 15926 + ... + 20463.

It is an arithmetic number, because the mean of its divisors is an integer number (20651325).

Almost surely, 2^82566641 is an apocalyptic number.

It is an amenable number.

82566641 is a deficient number, since it is larger than the sum of its proper divisors (38659).

82566641 is a wasteful number, since it uses less digits than its factorization.

82566641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38658.

The product of its digits is 69120, while the sum is 38.

The square root of 82566641 is about 9086.6187880861. The cubic root of 82566641 is about 435.4465683069.

The spelling of 82566641 in words is "eighty-two million, five hundred sixty-six thousand, six hundred forty-one".