638039288429 has 2 divisors, whose sum is σ = 638039288430. Its totient is φ = 638039288428.

The previous prime is 638039288353. The next prime is 638039288483. The reversal of 638039288429 is 924882930836.

638039288429 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 443125868329 + 194913420100 = 665677^2 + 441490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638039288429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638039288129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319019644214 + 319019644215.

It is an arithmetic number, because the mean of its divisors is an integer number (319019644215).

Almost surely, 2^638039288429 is an apocalyptic number.

It is an amenable number.

638039288429 is a deficient number, since it is larger than the sum of its proper divisors (1).

638039288429 is an equidigital number, since it uses as much as digits as its factorization.

638039288429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35831808, while the sum is 62.

The spelling of 638039288429 in words is "six hundred thirty-eight billion, thirty-nine million, two hundred eighty-eight thousand, four hundred twenty-nine".