78318035503 has 4 divisors (see below), whose sum is σ = 79198013520. Its totient is φ = 77438057488.

The previous prime is 78318035479. The next prime is 78318035513. The reversal of 78318035503 is 30553081387.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78318035503 is a prime.

It is a super-2 number, since 2×78318035503² (a number of 23 digits) contains 22 as substring.

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 78318035503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78318035513) 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, 439988875 + ... + 439989052.

It is an arithmetic number, because the mean of its divisors is an integer number (19799503380).

Almost surely, 2^78318035503 is an apocalyptic number.

78318035503 is a deficient number, since it is larger than the sum of its proper divisors (879978017).

78318035503 is an equidigital number, since it uses as much as digits as its factorization.

78318035503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879978016.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 78318035503 in words is "seventy-eight billion, three hundred eighteen million, thirty-five thousand, five hundred three".