2108666401 has 4 divisors (see below), whose sum is σ = 2108965012. Its totient is φ = 2108367792.

The previous prime is 2108666389. The next prime is 2108666419. The reversal of 2108666401 is 1046668012.

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 1070860176 + 1037806225 = 32724^2 + 32215^2 .

It is a cyclic number.

It is not a de Polignac number, because 2108666401 - 2¹⁷ = 2108535329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2108666201) 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, 138450 + ... + 152923.

It is an arithmetic number, because the mean of its divisors is an integer number (527241253).

Almost surely, 2^2108666401 is an apocalyptic number.

It is an amenable number.

2108666401 is a deficient number, since it is larger than the sum of its proper divisors (298611).

2108666401 is an equidigital number, since it uses as much as digits as its factorization.

2108666401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298610.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 2108666401 is about 45920.2177804069. The cubic root of 2108666401 is about 1282.3383365466.

The spelling of 2108666401 in words is "two billion, one hundred eight million, six hundred sixty-six thousand, four hundred one".