649887872117 has 16 divisors (see below), whose sum is σ = 738678196224. Its totient is φ = 566405382000.

The previous prime is 649887872099. The next prime is 649887872149. The reversal of 649887872117 is 711278788946.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 649887872117 - 2³⁸ = 375009965173 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 (649887872177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8869259 + ... + 8942232.

It is an arithmetic number, because the mean of its divisors is an integer number (46167387264).

Almost surely, 2^649887872117 is an apocalyptic number.

It is an amenable number.

649887872117 is a deficient number, since it is larger than the sum of its proper divisors (88790324107).

649887872117 is a wasteful number, since it uses less digits than its factorization.

649887872117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17811640.

The product of its digits is 75866112, while the sum is 68.

The spelling of 649887872117 in words is "six hundred forty-nine billion, eight hundred eighty-seven million, eight hundred seventy-two thousand, one hundred seventeen".