649122865517 has 32 divisors (see below), whose sum is σ = 783372902400. Its totient is φ = 525440625408.

The previous prime is 649122865487. The next prime is 649122865519. The reversal of 649122865517 is 715568221946.

It is a cyclic number.

It is not a de Polignac number, because 649122865517 - 2¹⁸ = 649122603373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649122865519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56701088 + ... + 56712534.

It is an arithmetic number, because the mean of its divisors is an integer number (24480403200).

Almost surely, 2^649122865517 is an apocalyptic number.

It is an amenable number.

649122865517 is a deficient number, since it is larger than the sum of its proper divisors (134250036883).

649122865517 is a wasteful number, since it uses less digits than its factorization.

649122865517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12785.

The product of its digits is 7257600, while the sum is 56.

The spelling of 649122865517 in words is "six hundred forty-nine billion, one hundred twenty-two million, eight hundred sixty-five thousand, five hundred seventeen".