2178317029912 has 8 divisors (see below), whose sum is σ = 4084344431100. Its totient is φ = 1089158514952.

The previous prime is 2178317029901. The next prime is 2178317029913. The reversal of 2178317029912 is 2199207138712.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 2178317029912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178317029913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136144814362 + ... + 136144814377.

Almost surely, 2^{2178317029912} is an apocalyptic number.

It is an amenable number.

2178317029912 is a deficient number, since it is larger than the sum of its proper divisors (1906027401188).

2178317029912 is a wasteful number, since it uses less digits than its factorization.

2178317029912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272289628745 (or 272289628741 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 52.

The spelling of 2178317029912 in words is "two trillion, one hundred seventy-eight billion, three hundred seventeen million, twenty-nine thousand, nine hundred twelve".