2001220020077 has 2 divisors, whose sum is σ = 2001220020078. Its totient is φ = 2001220020076.

The previous prime is 2001220019993. The next prime is 2001220020091. The reversal of 2001220020077 is 7700200221002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1767248525641 + 233971494436 = 1329379^2 + 483706^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001220020077 - 2¹² = 2001220015981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001220020677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000610010038 + 1000610010039.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610010039).

Almost surely, 2^{2001220020077} is an apocalyptic number.

It is an amenable number.

2001220020077 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001220020077 is an equidigital number, since it uses as much as digits as its factorization.

2001220020077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 23.

Adding to 2001220020077 its reverse (7700200221002), we get a palindrome (9701420241079).

The spelling of 2001220020077 in words is "two trillion, one billion, two hundred twenty million, twenty thousand, seventy-seven".