20191705952279 has 2 divisors, whose sum is σ = 20191705952280. Its totient is φ = 20191705952278.

The previous prime is 20191705952251. The next prime is 20191705952293. The reversal of 20191705952279 is 97225950719102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20191705952279 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20191705957279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10095852976139 + 10095852976140.

It is an arithmetic number, because the mean of its divisors is an integer number (10095852976140).

Almost surely, 2^{20191705952279} is an apocalyptic number.

20191705952279 is a deficient number, since it is larger than the sum of its proper divisors (1).

20191705952279 is an equidigital number, since it uses as much as digits as its factorization.

20191705952279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7144200, while the sum is 59.

The spelling of 20191705952279 in words is "twenty trillion, one hundred ninety-one billion, seven hundred five million, nine hundred fifty-two thousand, two hundred seventy-nine".