7842786081778 has 8 divisors (see below), whose sum is σ = 12014480806272. Its totient is φ = 3837959146356.

The previous prime is 7842786081749. The next prime is 7842786081787. The reversal of 7842786081778 is 8771806872487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 7842786081778.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41716947150 + ... + 41716947337.

It is an arithmetic number, because the mean of its divisors is an integer number (1501810100784).

Almost surely, 2^{7842786081778} is an apocalyptic number.

7842786081778 is a deficient number, since it is larger than the sum of its proper divisors (4171694724494).

7842786081778 is a wasteful number, since it uses less digits than its factorization.

7842786081778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83433894536.

The product of its (nonzero) digits is 472055808, while the sum is 73.

The spelling of 7842786081778 in words is "seven trillion, eight hundred forty-two billion, seven hundred eighty-six million, eighty-one thousand, seven hundred seventy-eight".