10215171866 has 4 divisors (see below), whose sum is σ = 15322757802. Its totient is φ = 5107585932.

The previous prime is 10215171847. The next prime is 10215171877. The reversal of 10215171866 is 66817151201.

10215171866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66817151201 = 491 ⋅136083811.

It can be written as a sum of positive squares in only one way, i.e., 5450721241 + 4764450625 = 73829^2 + 69025^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2553792965 + ... + 2553792968.

Almost surely, 2^10215171866 is an apocalyptic number.

10215171866 is a deficient number, since it is larger than the sum of its proper divisors (5107585936).

10215171866 is an equidigital number, since it uses as much as digits as its factorization.

10215171866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5107585935.

The product of its (nonzero) digits is 20160, while the sum is 38.

The spelling of 10215171866 in words is "ten billion, two hundred fifteen million, one hundred seventy-one thousand, eight hundred sixty-six".