78557553888116 has 6 divisors (see below), whose sum is σ = 137475719304210. Its totient is φ = 39278776944056.

The previous prime is 78557553888113. The next prime is 78557553888131. The reversal of 78557553888116 is 61188835575587.

It can be written as a sum of positive squares in only one way, i.e., 73337882572516 + 5219671315600 = 8563754^2 + 2284660^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78557553888113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9819694236011 + ... + 9819694236018.

It is an arithmetic number, because the mean of its divisors is an integer number (22912619884035).

Almost surely, 2^{78557553888116} is an apocalyptic number.

It is an amenable number.

78557553888116 is a deficient number, since it is larger than the sum of its proper divisors (58918165416094).

78557553888116 is a wasteful number, since it uses less digits than its factorization.

78557553888116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19639388472033 (or 19639388472031 counting only the distinct ones).

The product of its digits is 2257920000, while the sum is 77.

The spelling of 78557553888116 in words is "seventy-eight trillion, five hundred fifty-seven billion, five hundred fifty-three million, eight hundred eighty-eight thousand, one hundred sixteen".