78166814418 has 48 divisors (see below), whose sum is σ = 211151918016. Its totient is φ = 20303068320.

The previous prime is 78166814387. The next prime is 78166814449. The reversal of 78166814418 is 81441866187.

It is an interprime number because it is at equal distance from previous prime (78166814387) and next prime (78166814449).

It is a super-2 number, since 2×78166814418² (a number of 23 digits) contains 22 as substring.

It is a Curzon 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 in 23 ways as a sum of consecutive naturals, for example, 28197321 + ... + 28200092.

It is an arithmetic number, because the mean of its divisors is an integer number (4398998292).

Almost surely, 2^78166814418 is an apocalyptic number.

78166814418 is an abundant number, since it is smaller than the sum of its proper divisors (132985103598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78166814418 is a wasteful number, since it uses less digits than its factorization.

78166814418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56397439 (or 56397436 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The spelling of 78166814418 in words is "seventy-eight billion, one hundred sixty-six million, eight hundred fourteen thousand, four hundred eighteen".