78171313641783 has 16 divisors (see below), whose sum is σ = 109723809676800. Its totient is φ = 49366997614080.

The previous prime is 78171313641781. The next prime is 78171313641787. The reversal of 78171313641783 is 38714631317187.

It is not a de Polignac number, because 78171313641783 - 2¹ = 78171313641781 is a prime.

It is a super-2 number, since 2×78171313641783² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78171313641781) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 59881503 + ... + 61173008.

It is an arithmetic number, because the mean of its divisors is an integer number (6857738104800).

Almost surely, 2^{78171313641783} is an apocalyptic number.

78171313641783 is a deficient number, since it is larger than the sum of its proper divisors (31552496035017).

78171313641783 is a wasteful number, since it uses less digits than its factorization.

78171313641783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121065862.

The product of its digits is 14224896, while the sum is 60.

The spelling of 78171313641783 in words is "seventy-eight trillion, one hundred seventy-one billion, three hundred thirteen million, six hundred forty-one thousand, seven hundred eighty-three".