20013777661211 has 4 divisors (see below), whose sum is σ = 20352994231800. Its totient is φ = 19674561090624.

The previous prime is 20013777661139. The next prime is 20013777661219. The reversal of 20013777661211 is 11216677731002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20013777661211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20013777661219) 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 in 3 ways as a sum of consecutive naturals, for example, 169608285206 + ... + 169608285323.

It is an arithmetic number, because the mean of its divisors is an integer number (5088248557950).

Almost surely, 2^{20013777661211} is an apocalyptic number.

20013777661211 is a deficient number, since it is larger than the sum of its proper divisors (339216570589).

20013777661211 is an equidigital number, since it uses as much as digits as its factorization.

20013777661211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339216570588.

The product of its (nonzero) digits is 148176, while the sum is 44.

The spelling of 20013777661211 in words is "twenty trillion, thirteen billion, seven hundred seventy-seven million, six hundred sixty-one thousand, two hundred eleven".