78785748853571 has 4 divisors (see below), whose sum is σ = 78786027371352. Its totient is φ = 78785470335792.

The previous prime is 78785748853463. The next prime is 78785748853579. The reversal of 78785748853571 is 17535884758787.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78785748853571 - 2¹⁸ = 78785748591427 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 78785748853571.

It is not an unprimeable number, because it can be changed into a prime (78785748853579) 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, 138834146 + ... + 139400471.

It is an arithmetic number, because the mean of its divisors is an integer number (19696506842838).

Almost surely, 2^{78785748853571} is an apocalyptic number.

78785748853571 is a deficient number, since it is larger than the sum of its proper divisors (278517781).

78785748853571 is a wasteful number, since it uses less digits than its factorization.

78785748853571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278517780.

The product of its digits is 14751744000, while the sum is 83.

The spelling of 78785748853571 in words is "seventy-eight trillion, seven hundred eighty-five billion, seven hundred forty-eight million, eight hundred fifty-three thousand, five hundred seventy-one".