2178317920911 has 64 divisors (see below), whose sum is σ = 3246153899520. Its totient is φ = 1288182528000.

The previous prime is 2178317920907. The next prime is 2178317920921. The reversal of 2178317920911 is 1190297138712.

It is not a de Polignac number, because 2178317920911 - 2² = 2178317920907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178317920901) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 490499451 + ... + 490503891.

It is an arithmetic number, because the mean of its divisors is an integer number (50721154680).

Almost surely, 2^{2178317920911} is an apocalyptic number.

2178317920911 is a deficient number, since it is larger than the sum of its proper divisors (1067835978609).

2178317920911 is a wasteful number, since it uses less digits than its factorization.

2178317920911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6408.

The product of its (nonzero) digits is 381024, while the sum is 51.

The spelling of 2178317920911 in words is "two trillion, one hundred seventy-eight billion, three hundred seventeen million, nine hundred twenty thousand, nine hundred eleven".