19980353017 has 4 divisors (see below), whose sum is σ = 20520362596. Its totient is φ = 19440343440.

The previous prime is 19980352999. The next prime is 19980353059. The reversal of 19980353017 is 71035308991.

It is a happy number.

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 18603868816 + 1376484201 = 136396^2 + 37101^2 .

It is a cyclic number.

It is not a de Polignac number, because 19980353017 - 2¹¹ = 19980350969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19980353077) 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, 270004734 + ... + 270004807.

It is an arithmetic number, because the mean of its divisors is an integer number (5130090649).

Almost surely, 2^19980353017 is an apocalyptic number.

It is an amenable number.

19980353017 is a deficient number, since it is larger than the sum of its proper divisors (540009579).

19980353017 is an equidigital number, since it uses as much as digits as its factorization.

19980353017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540009578.

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 19980353017 in words is "nineteen billion, nine hundred eighty million, three hundred fifty-three thousand, seventeen".