1639888929073 has 4 divisors (see below), whose sum is σ = 1679886220068. Its totient is φ = 1599891638080.

The previous prime is 1639888929031. The next prime is 1639888929079. The reversal of 1639888929073 is 3709298889361.

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

It can be written as a sum of positive squares in 2 ways, for example, as 538327429264 + 1101561499809 = 733708^2 + 1049553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1639888929073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1639888928987 and 1639888929005.

It is not an unprimeable number, because it can be changed into a prime (1639888929079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19998645436 + ... + 19998645517.

It is an arithmetic number, because the mean of its divisors is an integer number (419971555017).

Almost surely, 2^{1639888929073} is an apocalyptic number.

It is an amenable number.

1639888929073 is a deficient number, since it is larger than the sum of its proper divisors (39997290995).

1639888929073 is an equidigital number, since it uses as much as digits as its factorization.

1639888929073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39997290994.

The product of its (nonzero) digits is 282175488, while the sum is 73.

The spelling of 1639888929073 in words is "one trillion, six hundred thirty-nine billion, eight hundred eighty-eight million, nine hundred twenty-nine thousand, seventy-three".