20111120177 has 2 divisors, whose sum is σ = 20111120178. Its totient is φ = 20111120176.

The previous prime is 20111120153. The next prime is 20111120231. The reversal of 20111120177 is 77102111102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15669030976 + 4442089201 = 125176^2 + 66649^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111120177 is a prime.

It is a super-2 number, since 2×20111120177² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20111122177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055560088 + 10055560089.

It is an arithmetic number, because the mean of its divisors is an integer number (10055560089).

Almost surely, 2^20111120177 is an apocalyptic number.

It is an amenable number.

20111120177 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111120177 is an equidigital number, since it uses as much as digits as its factorization.

20111120177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196, while the sum is 23.

Adding to 20111120177 its reverse (77102111102), we get a palindrome (97213231279).

The spelling of 20111120177 in words is "twenty billion, one hundred eleven million, one hundred twenty thousand, one hundred seventy-seven".