646009734666 has 16 divisors (see below), whose sum is σ = 1292081868000. Its totient is φ = 215326178448.

The previous prime is 646009734661. The next prime is 646009734673. The reversal of 646009734666 is 666437900646.

It is not an unprimeable number, because it can be changed into a prime (646009734661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2464816 + ... + 2714283.

It is an arithmetic number, because the mean of its divisors is an integer number (80755116750).

Almost surely, 2^646009734666 is an apocalyptic number.

646009734666 is an abundant number, since it is smaller than the sum of its proper divisors (646072133334).

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

646009734666 is a wasteful number, since it uses less digits than its factorization.

646009734666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5199893.

The product of its (nonzero) digits is 23514624, while the sum is 57.

The spelling of 646009734666 in words is "six hundred forty-six billion, nine million, seven hundred thirty-four thousand, six hundred sixty-six".