646481193918474 has 64 divisors (see below), whose sum is σ = 1366039573516800. Its totient is φ = 203631000427008.

The previous prime is 646481193918403. The next prime is 646481193918481. The reversal of 646481193918474 is 474819391184646.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 646481193918396 and 646481193918405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 336441712 + ... + 338357780.

It is an arithmetic number, because the mean of its divisors is an integer number (21344368336200).

Almost surely, 2^{646481193918474} is an apocalyptic number.

646481193918474 is an abundant number, since it is smaller than the sum of its proper divisors (719558379598326).

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

646481193918474 is a wasteful number, since it uses less digits than its factorization.

646481193918474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957407.

The product of its digits is 1003290624, while the sum is 75.

The spelling of 646481193918474 in words is "six hundred forty-six trillion, four hundred eighty-one billion, one hundred ninety-three million, nine hundred eighteen thousand, four hundred seventy-four".