649105497709 has 4 divisors (see below), whose sum is σ = 657997353916. Its totient is φ = 640213641504.

The previous prime is 649105497701. The next prime is 649105497727. The reversal of 649105497709 is 907794501946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 176307612100 + 472797885609 = 419890^2 + 687603^2 .

It is a cyclic number.

It is not a de Polignac number, because 649105497709 - 2³ = 649105497701 is a prime.

It is a super-3 number, since 3×649105497709³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649105497701) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4445927994 + ... + 4445928139.

It is an arithmetic number, because the mean of its divisors is an integer number (164499338479).

Almost surely, 2^649105497709 is an apocalyptic number.

It is an amenable number.

649105497709 is a deficient number, since it is larger than the sum of its proper divisors (8891856207).

649105497709 is an equidigital number, since it uses as much as digits as its factorization.

649105497709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8891856206.

The product of its (nonzero) digits is 17146080, while the sum is 61.

The spelling of 649105497709 in words is "six hundred forty-nine billion, one hundred five million, four hundred ninety-seven thousand, seven hundred nine".