20777512163 has 4 divisors (see below), whose sum is σ = 20782693728. Its totient is φ = 20772330600.

The previous prime is 20777512159. The next prime is 20777512219. The reversal of 20777512163 is 36121577702.

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

It is a cyclic number.

It is not a de Polignac number, because 20777512163 - 2² = 20777512159 is a prime.

It is a super-2 number, since 2×20777512163² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20777512163.

It is not an unprimeable number, because it can be changed into a prime (20777512103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2584763 + ... + 2592788.

It is an arithmetic number, because the mean of its divisors is an integer number (5195673432).

Almost surely, 2^20777512163 is an apocalyptic number.

20777512163 is a deficient number, since it is larger than the sum of its proper divisors (5181565).

20777512163 is an equidigital number, since it uses as much as digits as its factorization.

20777512163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5181564.

The product of its (nonzero) digits is 123480, while the sum is 41.

The spelling of 20777512163 in words is "twenty billion, seven hundred seventy-seven million, five hundred twelve thousand, one hundred sixty-three".