4206421266661 has 2 divisors, whose sum is σ = 4206421266662. Its totient is φ = 4206421266660.

The previous prime is 4206421266647. The next prime is 4206421266757. The reversal of 4206421266661 is 1666621246024.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4168661392900 + 37759873761 = 2041730^2 + 194319^2 .

It is a cyclic number.

It is not a de Polignac number, because 4206421266661 - 2⁷ = 4206421266533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4206421266461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2103210633330 + 2103210633331.

It is an arithmetic number, because the mean of its divisors is an integer number (2103210633331).

Almost surely, 2^{4206421266661} is an apocalyptic number.

It is an amenable number.

4206421266661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4206421266661 is an equidigital number, since it uses as much as digits as its factorization.

4206421266661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 46.

The spelling of 4206421266661 in words is "four trillion, two hundred six billion, four hundred twenty-one million, two hundred sixty-six thousand, six hundred sixty-one".