78785748853505 has 8 divisors (see below), whose sum is σ = 94672943881152. Its totient is φ = 62941902244848.

The previous prime is 78785748853463. The next prime is 78785748853579. The reversal of 78785748853505 is 50535884758787.

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

It is a cyclic number.

It is not a de Polignac number, because 78785748853505 - 2²⁸ = 78785480418049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78785748853505.

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 7 ways as a sum of consecutive naturals, for example, 10837100747 + ... + 10837108016.

It is an arithmetic number, because the mean of its divisors is an integer number (11834117985144).

Almost surely, 2^{78785748853505} is an apocalyptic number.

It is an amenable number.

78785748853505 is a deficient number, since it is larger than the sum of its proper divisors (15887195027647).

78785748853505 is a wasteful number, since it uses less digits than its factorization.

78785748853505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21674209495.

The product of its (nonzero) digits is 10536960000, while the sum is 80.

The spelling of 78785748853505 in words is "seventy-eight trillion, seven hundred eighty-five billion, seven hundred forty-eight million, eight hundred fifty-three thousand, five hundred five".