2166700385 has 4 divisors (see below), whose sum is σ = 2600040468. Its totient is φ = 1733360304.

The previous prime is 2166700381. The next prime is 2166700421. The reversal of 2166700385 is 5830076612.

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 735440161 + 1431260224 = 27119^2 + 37832^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166700385 - 2² = 2166700381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166700381) 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, 216670034 + ... + 216670043.

It is an arithmetic number, because the mean of its divisors is an integer number (650010117).

Almost surely, 2^2166700385 is an apocalyptic number.

It is an amenable number.

2166700385 is a deficient number, since it is larger than the sum of its proper divisors (433340083).

2166700385 is an equidigital number, since it uses as much as digits as its factorization.

2166700385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433340082.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 2166700385 is about 46547.8290041544. The cubic root of 2166700385 is about 1293.9960585613.

Adding to 2166700385 its reverse (5830076612), we get a palindrome (7996776997).

The spelling of 2166700385 in words is "two billion, one hundred sixty-six million, seven hundred thousand, three hundred eighty-five".