20457775522777 has 4 divisors (see below), whose sum is σ = 20458516317876. Its totient is φ = 20457034727680.

The previous prime is 20457775522757. The next prime is 20457775522781. The reversal of 20457775522777 is 77722557775402.

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 3977228501401 + 16480547021376 = 1994299^2 + 4059624^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20457775522777 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20457775522727) 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, 370356124 + ... + 370411357.

It is an arithmetic number, because the mean of its divisors is an integer number (5114629079469).

Almost surely, 2^{20457775522777} is an apocalyptic number.

It is an amenable number.

20457775522777 is a deficient number, since it is larger than the sum of its proper divisors (740795099).

20457775522777 is an equidigital number, since it uses as much as digits as its factorization.

20457775522777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740795098.

The product of its (nonzero) digits is 470596000, while the sum is 67.

The spelling of 20457775522777 in words is "twenty trillion, four hundred fifty-seven billion, seven hundred seventy-five million, five hundred twenty-two thousand, seven hundred seventy-seven".