7805780680217 has 4 divisors (see below), whose sum is σ = 8406225347940. Its totient is φ = 7205336012496.

The previous prime is 7805780680213. The next prime is 7805780680283. The reversal of 7805780680217 is 7120860875087.

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 3799922536921 + 4005858143296 = 1949339^2 + 2001464^2 .

It is a cyclic number.

It is not a de Polignac number, because 7805780680217 - 2² = 7805780680213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7805780680213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300222333842 + ... + 300222333867.

It is an arithmetic number, because the mean of its divisors is an integer number (2101556336985).

Almost surely, 2^{7805780680217} is an apocalyptic number.

It is an amenable number.

7805780680217 is a deficient number, since it is larger than the sum of its proper divisors (600444667723).

7805780680217 is a wasteful number, since it uses less digits than its factorization.

7805780680217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600444667722.

The product of its (nonzero) digits is 10536960, while the sum is 59.

The spelling of 7805780680217 in words is "seven trillion, eight hundred five billion, seven hundred eighty million, six hundred eighty thousand, two hundred seventeen".