2100066665 has 8 divisors (see below), whose sum is σ = 2531183040. Its totient is φ = 1672651312.

The previous prime is 2100066653. The next prime is 2100066671. The reversal of 2100066665 is 5666600012.

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

It is a cyclic number.

It is not a de Polignac number, because 2100066665 - 2⁴ = 2100066649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924005 + ... + 926274.

It is an arithmetic number, because the mean of its divisors is an integer number (316397880).

Almost surely, 2^2100066665 is an apocalyptic number.

It is an amenable number.

2100066665 is a deficient number, since it is larger than the sum of its proper divisors (431116375).

2100066665 is a wasteful number, since it uses less digits than its factorization.

2100066665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850511.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2100066665 is about 45826.4843185684. The cubic root of 2100066665 is about 1280.5927156076.

Adding to 2100066665 its reverse (5666600012), we get a palindrome (7766666677).

The spelling of 2100066665 in words is "two billion, one hundred million, sixty-six thousand, six hundred sixty-five".