6518649905478 has 12 divisors (see below), whose sum is σ = 14123741461908. Its totient is φ = 2172883301820.

The previous prime is 6518649905441. The next prime is 6518649905543. The reversal of 6518649905478 is 8745099468156.

6518649905478 is a `hidden beast` number, since 6 + 5 + 1 + 8 + 64 + 9 + 90 + 5 + 478 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 181073608468 + ... + 181073608503.

It is an arithmetic number, because the mean of its divisors is an integer number (1176978455159).

Almost surely, 2^{6518649905478} is an apocalyptic number.

6518649905478 is an abundant number, since it is smaller than the sum of its proper divisors (7605091556430).

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

6518649905478 is a wasteful number, since it uses less digits than its factorization.

6518649905478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362147216979 (or 362147216976 counting only the distinct ones).

The product of its (nonzero) digits is 522547200, while the sum is 72.

The spelling of 6518649905478 in words is "six trillion, five hundred eighteen billion, six hundred forty-nine million, nine hundred five thousand, four hundred seventy-eight".