20179782719 has 2 divisors, whose sum is σ = 20179782720. Its totient is φ = 20179782718.

The previous prime is 20179782641. The next prime is 20179782767. The reversal of 20179782719 is 91728797102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20179782719 - 2⁸ = 20179782463 is a prime.

It is a super-2 number, since 2×20179782719² (a number of 21 digits) contains 22 as substring.

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 (20179782319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10089891359 + 10089891360.

It is an arithmetic number, because the mean of its divisors is an integer number (10089891360).

Almost surely, 2^20179782719 is an apocalyptic number.

20179782719 is a deficient number, since it is larger than the sum of its proper divisors (1).

20179782719 is an equidigital number, since it uses as much as digits as its factorization.

20179782719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 889056, while the sum is 53.

The spelling of 20179782719 in words is "twenty billion, one hundred seventy-nine million, seven hundred eighty-two thousand, seven hundred nineteen".