513078778218 has 32 divisors (see below), whose sum is σ = 1127129587200. Its totient is φ = 154980316656.

The previous prime is 513078778213. The next prime is 513078778243. The reversal of 513078778218 is 812877870315.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (513078778213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97838488 + ... + 97843731.

It is an arithmetic number, because the mean of its divisors is an integer number (35222799600).

Almost surely, 2^513078778218 is an apocalyptic number.

513078778218 is an abundant number, since it is smaller than the sum of its proper divisors (614050808982).

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

513078778218 is a wasteful number, since it uses less digits than its factorization.

513078778218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195682266.

The product of its (nonzero) digits is 5268480, while the sum is 57.

The spelling of 513078778218 in words is "five hundred thirteen billion, seventy-eight million, seven hundred seventy-eight thousand, two hundred eighteen".