20263361661777 has 16 divisors (see below), whose sum is σ = 29096916860480. Its totient is φ = 12469414819392.

The previous prime is 20263361661737. The next prime is 20263361661787. The reversal of 20263361661777 is 77716616336202.

It is a happy number.

It is not a de Polignac number, because 20263361661777 - 2¹¹ = 20263361659729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20263361661727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5786263 + ... + 8602764.

It is an arithmetic number, because the mean of its divisors is an integer number (1818557303780).

Almost surely, 2^{20263361661777} is an apocalyptic number.

It is an amenable number.

20263361661777 is a deficient number, since it is larger than the sum of its proper divisors (8833555198703).

20263361661777 is a wasteful number, since it uses less digits than its factorization.

20263361661777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14425152.

The product of its (nonzero) digits is 16003008, while the sum is 57.

Adding to 20263361661777 its reverse (77716616336202), we get a palindrome (97979977997979).

The spelling of 20263361661777 in words is "twenty trillion, two hundred sixty-three billion, three hundred sixty-one million, six hundred sixty-one thousand, seven hundred seventy-seven".