2179785240361 has 4 divisors (see below), whose sum is σ = 2186749410772. Its totient is φ = 2172821069952.

The previous prime is 2179785240319. The next prime is 2179785240379. The reversal of 2179785240361 is 1630425879712.

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 207954240400 + 1971830999961 = 456020^2 + 1404219^2 .

It is a cyclic number.

It is not a de Polignac number, because 2179785240361 - 2³⁵ = 2145425501993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2179785247361) 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, 3482084736 + ... + 3482085361.

It is an arithmetic number, because the mean of its divisors is an integer number (546687352693).

It is a 1-persistent number, because it is pandigital, but 2⋅2179785240361 = 4359570480722 is not.

Almost surely, 2^{2179785240361} is an apocalyptic number.

It is an amenable number.

2179785240361 is a deficient number, since it is larger than the sum of its proper divisors (6964170411).

2179785240361 is an equidigital number, since it uses as much as digits as its factorization.

2179785240361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6964170410.

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 2179785240361 in words is "two trillion, one hundred seventy-nine billion, seven hundred eighty-five million, two hundred forty thousand, three hundred sixty-one".