20011111197149 has 2 divisors, whose sum is σ = 20011111197150. Its totient is φ = 20011111197148.

The previous prime is 20011111197053. The next prime is 20011111197211. The reversal of 20011111197149 is 94179111111002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19437138285049 + 573972912100 = 4408757^2 + 757610^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011111197149 - 2⁸ = 20011111196893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011111197349) 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 as a sum of consecutive naturals, namely, 10005555598574 + 10005555598575.

It is an arithmetic number, because the mean of its divisors is an integer number (10005555598575).

Almost surely, 2^{20011111197149} is an apocalyptic number.

It is an amenable number.

20011111197149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011111197149 is an equidigital number, since it uses as much as digits as its factorization.

20011111197149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 38.

The spelling of 20011111197149 in words is "twenty trillion, eleven billion, one hundred eleven million, one hundred ninety-seven thousand, one hundred forty-nine".