78327079918 has 4 divisors (see below), whose sum is σ = 117490619880. Its totient is φ = 39163539958.

The previous prime is 78327079877. The next prime is 78327079927. The reversal of 78327079918 is 81997072387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81997072387 = 307 ⋅267091441.

It is a super-2 number, since 2×78327079918² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19581769978 + ... + 19581769981.

It is an arithmetic number, because the mean of its divisors is an integer number (29372654970).

Almost surely, 2^78327079918 is an apocalyptic number.

78327079918 is a deficient number, since it is larger than the sum of its proper divisors (39163539962).

78327079918 is a wasteful number, since it uses less digits than its factorization.

78327079918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39163539961.

The product of its (nonzero) digits is 10668672, while the sum is 61.

The spelling of 78327079918 in words is "seventy-eight billion, three hundred twenty-seven million, seventy-nine thousand, nine hundred eighteen".