649347534856 has 8 divisors (see below), whose sum is σ = 1217526627870. Its totient is φ = 324673767424.

The previous prime is 649347534853. The next prime is 649347534881. The reversal of 649347534856 is 658435743946.

It can be written as a sum of positive squares in only one way, i.e., 594080226756 + 55267308100 = 770766^2 + 235090^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (649347534853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40584220921 + ... + 40584220936.

Almost surely, 2^649347534856 is an apocalyptic number.

It is an amenable number.

649347534856 is a deficient number, since it is larger than the sum of its proper divisors (568179093014).

649347534856 is a wasteful number, since it uses less digits than its factorization.

649347534856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81168441863 (or 81168441859 counting only the distinct ones).

The product of its digits is 261273600, while the sum is 64.

The spelling of 649347534856 in words is "six hundred forty-nine billion, three hundred forty-seven million, five hundred thirty-four thousand, eight hundred fifty-six".