20179755689 has 2 divisors, whose sum is σ = 20179755690. Its totient is φ = 20179755688.

The previous prime is 20179755677. The next prime is 20179755697. The reversal of 20179755689 is 98655797102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18790926400 + 1388829289 = 137080^2 + 37267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20179755689 is a prime.

It is not a weakly prime, because it can be changed into another prime (20179725689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10089877844 + 10089877845.

It is an arithmetic number, because the mean of its divisors is an integer number (10089877845).

Almost surely, 2^20179755689 is an apocalyptic number.

It is an amenable number.

20179755689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20179755689 is an equidigital number, since it uses as much as digits as its factorization.

20179755689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9525600, while the sum is 59.

The spelling of 20179755689 in words is "twenty billion, one hundred seventy-nine million, seven hundred fifty-five thousand, six hundred eighty-nine".