646605475254 has 24 divisors (see below), whose sum is σ = 1449288135360. Its totient is φ = 208102911408.

The previous prime is 646605475249. The next prime is 646605475267. The reversal of 646605475254 is 452574506646.

646605475254 is a `hidden beast` number, since 6 + 4 + 6 + 60 + 54 + 7 + 525 + 4 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 646605475254.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 619353382 + ... + 619354425.

It is an arithmetic number, because the mean of its divisors is an integer number (60387005640).

Almost surely, 2^646605475254 is an apocalyptic number.

646605475254 is an abundant number, since it is smaller than the sum of its proper divisors (802682660106).

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

646605475254 is a wasteful number, since it uses less digits than its factorization.

646605475254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238707844 (or 1238707841 counting only the distinct ones).

The product of its (nonzero) digits is 24192000, while the sum is 54.

The spelling of 646605475254 in words is "six hundred forty-six billion, six hundred five million, four hundred seventy-five thousand, two hundred fifty-four".