646730158518 has 32 divisors (see below), whose sum is σ = 1483538718720. Its totient is φ = 208622631240.

The previous prime is 646730158471. The next prime is 646730158519. The reversal of 646730158518 is 815851037646.

It is a happy number.

646730158518 is a `hidden beast` number, since 6 + 4 + 6 + 73 + 0 + 1 + 58 + 518 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646730158519) 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 15 ways as a sum of consecutive naturals, for example, 193167430 + ... + 193170777.

It is an arithmetic number, because the mean of its divisors is an integer number (46360584960).

Almost surely, 2^646730158518 is an apocalyptic number.

646730158518 is an abundant number, since it is smaller than the sum of its proper divisors (836808560202).

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

646730158518 is a wasteful number, since it uses less digits than its factorization.

646730158518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386338249 (or 386338243 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 54.

The spelling of 646730158518 in words is "six hundred forty-six billion, seven hundred thirty million, one hundred fifty-eight thousand, five hundred eighteen".