78277051818 has 96 divisors (see below), whose sum is σ = 197985295872. Its totient is φ = 21887424000.

The previous prime is 78277051799. The next prime is 78277051829. The reversal of 78277051818 is 81815077287.

It is a super-2 number, since 2×78277051818² (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 (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2663263 + ... + 2692493.

It is an arithmetic number, because the mean of its divisors is an integer number (2062346832).

Almost surely, 2^78277051818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78277051818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98992647936).

78277051818 is an abundant number, since it is smaller than the sum of its proper divisors (119708244054).

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

78277051818 is a wasteful number, since it uses less digits than its factorization.

78277051818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29700 (or 29697 counting only the distinct ones).

The product of its (nonzero) digits is 1756160, while the sum is 54.

The spelling of 78277051818 in words is "seventy-eight billion, two hundred seventy-seven million, fifty-one thousand, eight hundred eighteen".