7985784975667 has 4 divisors (see below), whose sum is σ = 8243390942656. Its totient is φ = 7728179008680.

The previous prime is 7985784975659. The next prime is 7985784975671. The reversal of 7985784975667 is 7665794875897.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7985784975667 - 2³ = 7985784975659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7985784975167) 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, 128802983448 + ... + 128802983509.

It is an arithmetic number, because the mean of its divisors is an integer number (2060847735664).

Almost surely, 2^{7985784975667} is an apocalyptic number.

7985784975667 is a deficient number, since it is larger than the sum of its proper divisors (257605966989).

7985784975667 is a wasteful number, since it uses less digits than its factorization.

7985784975667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257605966988.

The product of its digits is 44808422400, while the sum is 88.

The spelling of 7985784975667 in words is "seven trillion, nine hundred eighty-five billion, seven hundred eighty-four million, nine hundred seventy-five thousand, six hundred sixty-seven".