78855918685 has 8 divisors (see below), whose sum is σ = 94648997376. Its totient is φ = 63070138320.

The previous prime is 78855918637. The next prime is 78855918689. The reversal of 78855918685 is 58681955887.

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

It is not a de Polignac number, because 78855918685 - 2¹¹ = 78855916637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78855918689) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1800781 + ... + 1844050.

It is an arithmetic number, because the mean of its divisors is an integer number (11831124672).

Almost surely, 2^78855918685 is an apocalyptic number.

It is an amenable number.

78855918685 is a deficient number, since it is larger than the sum of its proper divisors (15793078691).

78855918685 is a wasteful number, since it uses less digits than its factorization.

78855918685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3649163.

The product of its digits is 193536000, while the sum is 70.

The spelling of 78855918685 in words is "seventy-eight billion, eight hundred fifty-five million, nine hundred eighteen thousand, six hundred eighty-five".