78065220646 has 16 divisors (see below), whose sum is σ = 134014862880. Its totient is φ = 33409330560.

The previous prime is 78065220631. The next prime is 78065220731. The reversal of 78065220646 is 64602256087.

It is a junction number, because it is equal to n+sod(n) for n = 78065220596 and 78065220605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3922435 + ... + 3942286.

It is an arithmetic number, because the mean of its divisors is an integer number (8375928930).

Almost surely, 2^78065220646 is an apocalyptic number.

78065220646 is a deficient number, since it is larger than the sum of its proper divisors (55949642234).

78065220646 is a wasteful number, since it uses less digits than its factorization.

78065220646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7865439.

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 78065220646 in words is "seventy-eight billion, sixty-five million, two hundred twenty thousand, six hundred forty-six".