649679289650 has 12 divisors (see below), whose sum is σ = 1208403478842. Its totient is φ = 259871715840.

The previous prime is 649679289647. The next prime is 649679289667. The reversal of 649679289650 is 56982976946.

It can be written as a sum of positive squares in 3 ways, for example, as 294309505009 + 355369784641 = 542503^2 + 596129^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6496792847 + ... + 6496792946.

Almost surely, 2^649679289650 is an apocalyptic number.

649679289650 is a deficient number, since it is larger than the sum of its proper divisors (558724189192).

649679289650 is a wasteful number, since it uses less digits than its factorization.

649679289650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12993585805 (or 12993585800 counting only the distinct ones).

The product of its (nonzero) digits is 352719360, while the sum is 71.

The spelling of 649679289650 in words is "six hundred forty-nine billion, six hundred seventy-nine million, two hundred eighty-nine thousand, six hundred fifty".