7780065686 has 16 divisors (see below), whose sum is σ = 11721894000. Its totient is φ = 3872806560.

The previous prime is 7780065677. The next prime is 7780065697. The reversal of 7780065686 is 6865600877.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 410900 + ... + 429416.

It is an arithmetic number, because the mean of its divisors is an integer number (732618375).

Almost surely, 2^7780065686 is an apocalyptic number.

7780065686 is a deficient number, since it is larger than the sum of its proper divisors (3941828314).

7780065686 is a wasteful number, since it uses less digits than its factorization.

7780065686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19439.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The square root of 7780065686 is about 88204.6806354402. The cubic root of 7780065686 is about 1981.5015720832.

The spelling of 7780065686 in words is "seven billion, seven hundred eighty million, sixty-five thousand, six hundred eighty-six".