4126506665 has 4 divisors (see below), whose sum is σ = 4951808004. Its totient is φ = 3301205328.

The previous prime is 4126506649. The next prime is 4126506667. The reversal of 4126506665 is 5666056214.

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 1699170841 + 2427335824 = 41221^2 + 49268^2 .

It is a cyclic number.

It is not a de Polignac number, because 4126506665 - 2⁴ = 4126506649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4126506667) 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, 412650662 + ... + 412650671.

It is an arithmetic number, because the mean of its divisors is an integer number (1237952001).

Almost surely, 2^4126506665 is an apocalyptic number.

It is an amenable number.

4126506665 is a deficient number, since it is larger than the sum of its proper divisors (825301339).

4126506665 is an equidigital number, since it uses as much as digits as its factorization.

4126506665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825301338.

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 4126506665 is about 64237.8911935938. The cubic root of 4126506665 is about 1603.9624010160.

The spelling of 4126506665 in words is "four billion, one hundred twenty-six million, five hundred six thousand, six hundred sixty-five".