20077699111681 has 4 divisors (see below), whose sum is σ = 20077898750164. Its totient is φ = 20077499473200.

The previous prime is 20077699111669. The next prime is 20077699111727. The reversal of 20077699111681 is 18611199677002.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16142073998400 + 3935625113281 = 4017720^2 + 1983841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20077699111681 is a prime.

It is a super-2 number, since 2×20077699111681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20077699111081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99668310 + ... + 99869551.

It is an arithmetic number, because the mean of its divisors is an integer number (5019474687541).

Almost surely, 2^{20077699111681} is an apocalyptic number.

It is an amenable number.

20077699111681 is a deficient number, since it is larger than the sum of its proper divisors (199638483).

20077699111681 is a wasteful number, since it uses less digits than its factorization.

20077699111681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199638482.

The product of its (nonzero) digits is 2286144, while the sum is 58.

The spelling of 20077699111681 in words is "twenty trillion, seventy-seven billion, six hundred ninety-nine million, one hundred eleven thousand, six hundred eighty-one".