2105101666 has 4 divisors (see below), whose sum is σ = 3157652502. Its totient is φ = 1052550832.

The previous prime is 2105101639. The next prime is 2105101697. The reversal of 2105101666 is 6661015012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1969495641 + 135606025 = 44379^2 + 11645^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 526275415 + ... + 526275418.

Almost surely, 2^2105101666 is an apocalyptic number.

2105101666 is a deficient number, since it is larger than the sum of its proper divisors (1052550836).

2105101666 is a wasteful number, since it uses less digits than its factorization.

2105101666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052550835.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2105101666 is about 45881.3869232394. The cubic root of 2105101666 is about 1281.6153243363.

Adding to 2105101666 its reverse (6661015012), we get a palindrome (8766116678).

The spelling of 2105101666 in words is "two billion, one hundred five million, one hundred one thousand, six hundred sixty-six".