38638071557 has 2 divisors, whose sum is σ = 38638071558. Its totient is φ = 38638071556.

The previous prime is 38638071491. The next prime is 38638071569. The reversal of 38638071557 is 75517083683.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20127380641 + 18510690916 = 141871^2 + 136054^2 .

It is a cyclic number.

It is not a de Polignac number, because 38638071557 - 2⁸ = 38638071301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 38638071499 and 38638071508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38638071457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19319035778 + 19319035779.

It is an arithmetic number, because the mean of its divisors is an integer number (19319035779).

Almost surely, 2^38638071557 is an apocalyptic number.

It is an amenable number.

38638071557 is a deficient number, since it is larger than the sum of its proper divisors (1).

38638071557 is an equidigital number, since it uses as much as digits as its factorization.

38638071557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 38638071557 in words is "thirty-eight billion, six hundred thirty-eight million, seventy-one thousand, five hundred fifty-seven".