4138663729 has 2 divisors, whose sum is σ = 4138663730. Its totient is φ = 4138663728.

The previous prime is 4138663709. The next prime is 4138663757. The reversal of 4138663729 is 9273668314.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3164287504 + 974376225 = 56252^2 + 31215^2 .

It is a cyclic number.

It is not a de Polignac number, because 4138663729 - 2¹³ = 4138655537 is a prime.

It is not a weakly prime, because it can be changed into another prime (4138663709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2069331864 + 2069331865.

It is an arithmetic number, because the mean of its divisors is an integer number (2069331865).

Almost surely, 2^4138663729 is an apocalyptic number.

It is an amenable number.

4138663729 is a deficient number, since it is larger than the sum of its proper divisors (1).

4138663729 is an equidigital number, since it uses as much as digits as its factorization.

4138663729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 49.

The square root of 4138663729 is about 64332.4469377623. The cubic root of 4138663729 is about 1605.5359964201.

The spelling of 4138663729 in words is "four billion, one hundred thirty-eight million, six hundred sixty-three thousand, seven hundred twenty-nine".