38725646429 has 2 divisors, whose sum is σ = 38725646430. Its totient is φ = 38725646428.

The previous prime is 38725646353. The next prime is 38725646507. The reversal of 38725646429 is 92464652783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37191122500 + 1534523929 = 192850^2 + 39173^2 .

It is an emirp because it is prime and its reverse (92464652783) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38725646429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38725646329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19362823214 + 19362823215.

It is an arithmetic number, because the mean of its divisors is an integer number (19362823215).

Almost surely, 2^38725646429 is an apocalyptic number.

It is an amenable number.

38725646429 is a deficient number, since it is larger than the sum of its proper divisors (1).

38725646429 is an equidigital number, since it uses as much as digits as its factorization.

38725646429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 56.

The spelling of 38725646429 in words is "thirty-eight billion, seven hundred twenty-five million, six hundred forty-six thousand, four hundred twenty-nine".