78617018652 has 12 divisors (see below), whose sum is σ = 183439710216. Its totient is φ = 26205672880.

The previous prime is 78617018639. The next prime is 78617018659. The reversal of 78617018652 is 25681071687.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×78617018652³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78617018595 and 78617018604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78617018659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3275709099 + ... + 3275709122.

It is an arithmetic number, because the mean of its divisors is an integer number (15286642518).

Almost surely, 2^78617018652 is an apocalyptic number.

It is an amenable number.

78617018652 is an abundant number, since it is smaller than the sum of its proper divisors (104822691564).

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

78617018652 is a wasteful number, since it uses less digits than its factorization.

78617018652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6551418228 (or 6551418226 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 51.

The spelling of 78617018652 in words is "seventy-eight billion, six hundred seventeen million, eighteen thousand, six hundred fifty-two".