4279645621 has 2 divisors, whose sum is σ = 4279645622. Its totient is φ = 4279645620.

The previous prime is 4279645597. The next prime is 4279645651. The reversal of 4279645621 is 1265469724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4265918596 + 13727025 = 65314^2 + 3705^2 .

It is a cyclic number.

It is not a de Polignac number, because 4279645621 - 2⁷ = 4279645493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4279645651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2139822810 + 2139822811.

It is an arithmetic number, because the mean of its divisors is an integer number (2139822811).

Almost surely, 2^4279645621 is an apocalyptic number.

It is an amenable number.

4279645621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4279645621 is an equidigital number, since it uses as much as digits as its factorization.

4279645621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 46.

The square root of 4279645621 is about 65419.0004585824. Note that the first 3 decimals coincide. The cubic root of 4279645621 is about 1623.5634636669.

The spelling of 4279645621 in words is "four billion, two hundred seventy-nine million, six hundred forty-five thousand, six hundred twenty-one".