518620854978 has 32 divisors (see below), whose sum is σ = 1153628611200. Its totient is φ = 172702945008.

The previous prime is 518620854959. The next prime is 518620854991. The reversal of 518620854978 is 879458026815.

518620854978 is a `hidden beast` number, since 5 + 1 + 8 + 62 + 0 + 85 + 497 + 8 = 666.

It is a super-2 number, since 2×518620854978² (a number of 24 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 15 ways as a sum of consecutive naturals, for example, 4685718 + ... + 4795121.

It is an arithmetic number, because the mean of its divisors is an integer number (36050894100).

Almost surely, 2^518620854978 is an apocalyptic number.

518620854978 is an abundant number, since it is smaller than the sum of its proper divisors (635007756222).

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

518620854978 is a wasteful number, since it uses less digits than its factorization.

518620854978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9481863 (or 9481857 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 63.

The spelling of 518620854978 in words is "five hundred eighteen billion, six hundred twenty million, eight hundred fifty-four thousand, nine hundred seventy-eight".