518923648420 has 12 divisors (see below), whose sum is σ = 1089739661724. Its totient is φ = 207569459360.

The previous prime is 518923648357. The next prime is 518923648421. The reversal of 518923648420 is 24846329815.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 385770178816 + 133153469604 = 621104^2 + 364902^2 .

It is a super-3 number, since 3×518923648420³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (518923648421) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 12973091191 + ... + 12973091230.

It is an arithmetic number, because the mean of its divisors is an integer number (90811638477).

Almost surely, 2^518923648420 is an apocalyptic number.

It is an amenable number.

518923648420 is an abundant number, since it is smaller than the sum of its proper divisors (570816013304).

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

518923648420 is a wasteful number, since it uses less digits than its factorization.

518923648420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25946182430 (or 25946182428 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 52.

The spelling of 518923648420 in words is "five hundred eighteen billion, nine hundred twenty-three million, six hundred forty-eight thousand, four hundred twenty".