78181118471851 has 16 divisors (see below), whose sum is σ = 80333168370400. Its totient is φ = 76044260436480.

The previous prime is 78181118471849. The next prime is 78181118471959. The reversal of 78181118471851 is 15817481118187.

It is a cyclic number.

It is not a de Polignac number, because 78181118471851 - 2¹ = 78181118471849 is a prime.

It is a super-4 number, since 4×78181118471851⁴ (a number of 57 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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 78181118471851.

It is not an unprimeable number, because it can be changed into a prime (78181118471051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 662644501 + ... + 662762473.

It is an arithmetic number, because the mean of its divisors is an integer number (5020823023150).

Almost surely, 2^{78181118471851} is an apocalyptic number.

78181118471851 is a deficient number, since it is larger than the sum of its proper divisors (2152049898549).

78181118471851 is a wasteful number, since it uses less digits than its factorization.

78181118471851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182206.

The product of its digits is 4014080, while the sum is 61.

The spelling of 78181118471851 in words is "seventy-eight trillion, one hundred eighty-one billion, one hundred eighteen million, four hundred seventy-one thousand, eight hundred fifty-one".