4065624421 has 2 divisors, whose sum is σ = 4065624422. Its totient is φ = 4065624420.

The previous prime is 4065624413. The next prime is 4065624473. The reversal of 4065624421 is 1244265604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4021335396 + 44289025 = 63414^2 + 6655^2 .

It is a cyclic number.

It is not a de Polignac number, because 4065624421 - 2³ = 4065624413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4065654421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2032812210 + 2032812211.

It is an arithmetic number, because the mean of its divisors is an integer number (2032812211).

Almost surely, 2^4065624421 is an apocalyptic number.

It is an amenable number.

4065624421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4065624421 is an equidigital number, since it uses as much as digits as its factorization.

4065624421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 4065624421 is about 63762.2491839803. The cubic root of 4065624421 is about 1596.0350289787.

The spelling of 4065624421 in words is "four billion, sixty-five million, six hundred twenty-four thousand, four hundred twenty-one".