4165663421 has 2 divisors, whose sum is σ = 4165663422. Its totient is φ = 4165663420.

The previous prime is 4165663363. The next prime is 4165663441. The reversal of 4165663421 is 1243665614.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4043560921 + 122102500 = 63589^2 + 11050^2 .

It is a cyclic number.

It is not a de Polignac number, because 4165663421 - 2¹⁸ = 4165401277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4165663441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2082831710 + 2082831711.

It is an arithmetic number, because the mean of its divisors is an integer number (2082831711).

Almost surely, 2^4165663421 is an apocalyptic number.

It is an amenable number.

4165663421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4165663421 is an equidigital number, since it uses as much as digits as its factorization.

4165663421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 38.

The square root of 4165663421 is about 64541.9508614359. The cubic root of 4165663421 is about 1609.0198142370.

The spelling of 4165663421 in words is "four billion, one hundred sixty-five million, six hundred sixty-three thousand, four hundred twenty-one".