78538853556538 has 8 divisors (see below), whose sum is σ = 118124120229588. Its totient is φ = 39164146813344.

The previous prime is 78538853556523. The next prime is 78538853556557. The reversal of 78538853556538 is 83565535883587.

It can be written as a sum of positive squares in 2 ways, for example, as 77570347604409 + 968505952129 = 8807403^2 + 984127^2 .

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

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, 52639981531 + ... + 52639983022.

Almost surely, 2^{78538853556538} is an apocalyptic number.

78538853556538 is a deficient number, since it is larger than the sum of its proper divisors (39585266673050).

78538853556538 is a wasteful number, since it uses less digits than its factorization.

78538853556538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105279964928.

The product of its digits is 14515200000, while the sum is 79.

The spelling of 78538853556538 in words is "seventy-eight trillion, five hundred thirty-eight billion, eight hundred fifty-three million, five hundred fifty-six thousand, five hundred thirty-eight".