649667497808 has 80 divisors (see below), whose sum is σ = 1459975912704. Its totient is φ = 274288143360.

The previous prime is 649667497783. The next prime is 649667497811. The reversal of 649667497808 is 808794766946.

It is a congruent number.

It is an unprimeable number.

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, 10122716 + ... + 10186692.

Almost surely, 2^649667497808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649667497808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (729987956352).

649667497808 is an abundant number, since it is smaller than the sum of its proper divisors (810308414896).

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

649667497808 is a wasteful number, since it uses less digits than its factorization.

649667497808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65340 (or 65334 counting only the distinct ones).

The product of its (nonzero) digits is 877879296, while the sum is 74.

The spelling of 649667497808 in words is "six hundred forty-nine billion, six hundred sixty-seven million, four hundred ninety-seven thousand, eight hundred eight".