646643331546 has 16 divisors (see below), whose sum is σ = 1295768985408. Its totient is φ = 215134056800.

The previous prime is 646643331541. The next prime is 646643331569. The reversal of 646643331546 is 645133346646.

It is not an unprimeable number, because it can be changed into a prime (646643331541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103426710 + ... + 103432961.

It is an arithmetic number, because the mean of its divisors is an integer number (80985561588).

Almost surely, 2^646643331546 is an apocalyptic number.

646643331546 is an abundant number, since it is smaller than the sum of its proper divisors (649125653862).

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

646643331546 is a wasteful number, since it uses less digits than its factorization.

646643331546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206860197.

The product of its digits is 11197440, while the sum is 51.

The spelling of 646643331546 in words is "six hundred forty-six billion, six hundred forty-three million, three hundred thirty-one thousand, five hundred forty-six".