220111001977 has 2 divisors, whose sum is σ = 220111001978. Its totient is φ = 220111001976.

The previous prime is 220111001959. The next prime is 220111002031. The reversal of 220111001977 is 779100111022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210964757481 + 9146244496 = 459309^2 + 95636^2 .

It is a cyclic number.

It is not a de Polignac number, because 220111001977 - 2¹⁹ = 220110477689 is a prime.

It is a super-3 number, since 3×220111001977³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (220111001377) 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, 110055500988 + 110055500989.

It is an arithmetic number, because the mean of its divisors is an integer number (110055500989).

Almost surely, 2^220111001977 is an apocalyptic number.

It is an amenable number.

220111001977 is a deficient number, since it is larger than the sum of its proper divisors (1).

220111001977 is an equidigital number, since it uses as much as digits as its factorization.

220111001977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 31.

Adding to 220111001977 its reverse (779100111022), we get a palindrome (999211112999).

The spelling of 220111001977 in words is "two hundred twenty billion, one hundred eleven million, one thousand, nine hundred seventy-seven".