82105663 has 4 divisors (see below), whose sum is σ = 83852640. Its totient is φ = 80358688.

The previous prime is 82105651. The next prime is 82105679. The reversal of 82105663 is 36650128.

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

It is a cyclic number.

It is not a de Polignac number, because 82105663 - 2²⁵ = 48551231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82105603) 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, 873418 + ... + 873511.

It is an arithmetic number, because the mean of its divisors is an integer number (20963160).

Almost surely, 2^82105663 is an apocalyptic number.

82105663 is a deficient number, since it is larger than the sum of its proper divisors (1746977).

82105663 is a wasteful number, since it uses less digits than its factorization.

82105663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746976.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 82105663 is about 9061.2175230484. The cubic root of 82105663 is about 434.6346745584.

The spelling of 82105663 in words is "eighty-two million, one hundred five thousand, six hundred sixty-three".