12171026777 has 32 divisors (see below), whose sum is σ = 15549972480. Its totient is φ = 9266736960.

The previous prime is 12171026759. The next prime is 12171026779. The reversal of 12171026777 is 77762017121.

12171026777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12171026777 - 2¹⁰ = 12171025753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12171026779) 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 31 ways as a sum of consecutive naturals, for example, 492908 + ... + 517010.

It is an arithmetic number, because the mean of its divisors is an integer number (485936640).

Almost surely, 2^12171026777 is an apocalyptic number.

It is an amenable number.

12171026777 is a deficient number, since it is larger than the sum of its proper divisors (3378945703).

12171026777 is a wasteful number, since it uses less digits than its factorization.

12171026777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24333.

The product of its (nonzero) digits is 57624, while the sum is 41.

The spelling of 12171026777 in words is "twelve billion, one hundred seventy-one million, twenty-six thousand, seven hundred seventy-seven".