12920545777 has 4 divisors (see below), whose sum is σ = 12924167536. Its totient is φ = 12916924020.

The previous prime is 12920545733. The next prime is 12920545823. The reversal of 12920545777 is 77754502921.

12920545777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12920545777 - 2¹¹ = 12920543729 is a prime.

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 12920545777.

It is not an unprimeable number, because it can be changed into a prime (12920546777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1805523 + ... + 1812664.

It is an arithmetic number, because the mean of its divisors is an integer number (3231041884).

Almost surely, 2^12920545777 is an apocalyptic number.

It is an amenable number.

12920545777 is a deficient number, since it is larger than the sum of its proper divisors (3621759).

12920545777 is an equidigital number, since it uses as much as digits as its factorization.

12920545777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621758.

The product of its (nonzero) digits is 1234800, while the sum is 49.

The spelling of 12920545777 in words is "twelve billion, nine hundred twenty million, five hundred forty-five thousand, seven hundred seventy-seven".