8566916021 has 4 divisors (see below), whose sum is σ = 8619473952. Its totient is φ = 8514358092.

The previous prime is 8566915997. The next prime is 8566916081. The reversal of 8566916021 is 1206196658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8566916021 - 2⁶ = 8566915957 is a prime.

It is a super-2 number, since 2×8566916021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8566916081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26278721 + ... + 26279046.

It is an arithmetic number, because the mean of its divisors is an integer number (2154868488).

Almost surely, 2^8566916021 is an apocalyptic number.

It is an amenable number.

8566916021 is a deficient number, since it is larger than the sum of its proper divisors (52557931).

8566916021 is a wasteful number, since it uses less digits than its factorization.

8566916021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52557930.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 8566916021 is about 92557.6362111738. The cubic root of 8566916021 is about 2046.1690118528.

The spelling of 8566916021 in words is "eight billion, five hundred sixty-six million, nine hundred sixteen thousand, twenty-one".