7925845664778 has 64 divisors (see below), whose sum is σ = 16621359563520. Its totient is φ = 2516863145472.

The previous prime is 7925845664771. The next prime is 7925845664791. The reversal of 7925845664778 is 8774665485297.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7925845664771) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 5038438 + ... + 6421646.

It is an arithmetic number, because the mean of its divisors is an integer number (259708743180).

Almost surely, 2^{7925845664778} is an apocalyptic number.

7925845664778 is an abundant number, since it is smaller than the sum of its proper divisors (8695513898742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7925845664778 is a wasteful number, since it uses less digits than its factorization.

7925845664778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383791.

The product of its digits is 5689958400, while the sum is 78.

The spelling of 7925845664778 in words is "seven trillion, nine hundred twenty-five billion, eight hundred forty-five million, six hundred sixty-four thousand, seven hundred seventy-eight".