649644012000 has 144 divisors (see below), whose sum is σ = 2305586726352. Its totient is φ = 173238393600.

The previous prime is 649644011983. The next prime is 649644012001. The reversal of 649644012000 is 210446946.

649644012000 is a `hidden beast` number, since 6 + 4 + 9 + 6 + 440 + 1 + 200 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×649644012000² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649644012001) 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 23 ways as a sum of consecutive naturals, for example, 8986834 + ... + 9058833.

It is an arithmetic number, because the mean of its divisors is an integer number (16011018933).

Almost surely, 2^649644012000 is an apocalyptic number.

649644012000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

649644012000 is an abundant number, since it is smaller than the sum of its proper divisors (1655942714352).

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

649644012000 is a wasteful number, since it uses less digits than its factorization.

649644012000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18045698 (or 18045677 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

Adding to 649644012000 its reverse (210446946), we get a palindrome (649854458946).

The spelling of 649644012000 in words is "six hundred forty-nine billion, six hundred forty-four million, twelve thousand".