7878187878068 has 6 divisors (see below), whose sum is σ = 13786828786626. Its totient is φ = 3939093939032.

The previous prime is 7878187878053. The next prime is 7878187878091. The reversal of 7878187878068 is 8608787818787.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6077792841124 + 1800395036944 = 2465318^2 + 1341788^2 .

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 as a sum of consecutive naturals, namely, 984773484755 + ... + 984773484762.

It is an arithmetic number, because the mean of its divisors is an integer number (2297804797771).

Almost surely, 2^{7878187878068} is an apocalyptic number.

It is an amenable number.

7878187878068 is a deficient number, since it is larger than the sum of its proper divisors (5908640908558).

7878187878068 is a wasteful number, since it uses less digits than its factorization.

7878187878068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1969546969521 (or 1969546969519 counting only the distinct ones).

The product of its (nonzero) digits is 3776446464, while the sum is 83.

The spelling of 7878187878068 in words is "seven trillion, eight hundred seventy-eight billion, one hundred eighty-seven million, eight hundred seventy-eight thousand, sixty-eight".