649213829817 has 72 divisors (see below), whose sum is σ = 1045964745216. Its totient is φ = 357117768000.

The previous prime is 649213829813. The next prime is 649213829833. The reversal of 649213829817 is 718928312946.

It is not a de Polignac number, because 649213829817 - 2² = 649213829813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (649213829813) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 26969967 + ... + 26994027.

It is an arithmetic number, because the mean of its divisors is an integer number (14527288128).

Almost surely, 2^649213829817 is an apocalyptic number.

It is an amenable number.

649213829817 is a deficient number, since it is larger than the sum of its proper divisors (396750915399).

649213829817 is a wasteful number, since it uses less digits than its factorization.

649213829817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24331 (or 24293 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 60.

The spelling of 649213829817 in words is "six hundred forty-nine billion, two hundred thirteen million, eight hundred twenty-nine thousand, eight hundred seventeen".