2166621086 has 8 divisors (see below), whose sum is σ = 3714207600. Its totient is φ = 928551888.

The previous prime is 2166621077. The next prime is 2166621113. The reversal of 2166621086 is 6801266612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77379311 + ... + 77379338.

It is an arithmetic number, because the mean of its divisors is an integer number (464275950).

Almost surely, 2^2166621086 is an apocalyptic number.

2166621086 is a deficient number, since it is larger than the sum of its proper divisors (1547586514).

2166621086 is a wasteful number, since it uses less digits than its factorization.

2166621086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154758658.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 2166621086 is about 46546.9771950875. The cubic root of 2166621086 is about 1293.9802720616.

Adding to 2166621086 its reverse (6801266612), we get a palindrome (8967887698).

The spelling of 2166621086 in words is "two billion, one hundred sixty-six million, six hundred twenty-one thousand, eighty-six".