78171782443 has 4 divisors (see below), whose sum is σ = 78272911008. Its totient is φ = 78070653880.

The previous prime is 78171782419. The next prime is 78171782453. The reversal of 78171782443 is 34428717187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34428717187 = 48017 ⋅717011.

It is a cyclic number.

It is not a de Polignac number, because 78171782443 - 2¹³ = 78171774251 is a prime.

It is a super-2 number, since 2×78171782443² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78171782413) 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, 50563123 + ... + 50564668.

It is an arithmetic number, because the mean of its divisors is an integer number (19568227752).

Almost surely, 2^78171782443 is an apocalyptic number.

78171782443 is a deficient number, since it is larger than the sum of its proper divisors (101128565).

78171782443 is a wasteful number, since it uses less digits than its factorization.

78171782443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101128564.

The product of its digits is 2107392, while the sum is 52.

The spelling of 78171782443 in words is "seventy-eight billion, one hundred seventy-one million, seven hundred eighty-two thousand, four hundred forty-three".