19905950658983 has 4 divisors (see below), whose sum is σ = 20443949325480. Its totient is φ = 19367951992488.

The previous prime is 19905950658929. The next prime is 19905950659009. The reversal of 19905950658983 is 38985605950991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19905950658983 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 (19905950628983) 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, 268999333193 + ... + 268999333266.

It is an arithmetic number, because the mean of its divisors is an integer number (5110987331370).

Almost surely, 2^{19905950658983} is an apocalyptic number.

19905950658983 is a deficient number, since it is larger than the sum of its proper divisors (537998666497).

19905950658983 is an equidigital number, since it uses as much as digits as its factorization.

19905950658983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537998666496.

The product of its (nonzero) digits is 944784000, while the sum is 77.

The spelling of 19905950658983 in words is "nineteen trillion, nine hundred five billion, nine hundred fifty million, six hundred fifty-eight thousand, nine hundred eighty-three".