19938806070805 has 8 divisors (see below), whose sum is σ = 23935452027192. Its totient is φ = 15945121695168.

The previous prime is 19938806070787. The next prime is 19938806070809. The reversal of 19938806070805 is 50807060883991.

It can be written as a sum of positive squares in 4 ways, for example, as 889064181604 + 19049741889201 = 942902^2 + 4364601^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19938806070805 - 2⁵ = 19938806070773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19938806070809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 740380374 + ... + 740407303.

It is an arithmetic number, because the mean of its divisors is an integer number (2991931503399).

Almost surely, 2^{19938806070805} is an apocalyptic number.

It is an amenable number.

19938806070805 is a deficient number, since it is larger than the sum of its proper divisors (3996645956387).

19938806070805 is a wasteful number, since it uses less digits than its factorization.

19938806070805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480790375.

The product of its (nonzero) digits is 26127360, while the sum is 64.

The spelling of 19938806070805 in words is "nineteen trillion, nine hundred thirty-eight billion, eight hundred six million, seventy thousand, eight hundred five".