38665984529729 has 4 divisors (see below), whose sum is σ = 38666133458820. Its totient is φ = 38665835600640.

The previous prime is 38665984529717. The next prime is 38665984529741. The reversal of 38665984529729 is 92792548956683.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (38665984529717) and next prime (38665984529741).

It can be written as a sum of positive squares in 2 ways, for example, as 21070073746225 + 17595910783504 = 4590215^2 + 4194748^2 .

It is a cyclic number.

It is not a de Polignac number, because 38665984529729 - 2¹⁶ = 38665984464193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38665984529429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74074424 + ... + 74594585.

It is an arithmetic number, because the mean of its divisors is an integer number (9666533364705).

Almost surely, 2^{38665984529729} is an apocalyptic number.

It is an amenable number.

38665984529729 is a deficient number, since it is larger than the sum of its proper divisors (148929091).

38665984529729 is a wasteful number, since it uses less digits than its factorization.

38665984529729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148929090.

The product of its digits is 14108774400, while the sum is 83.

The spelling of 38665984529729 in words is "thirty-eight trillion, six hundred sixty-five billion, nine hundred eighty-four million, five hundred twenty-nine thousand, seven hundred twenty-nine".