649919506655 has 16 divisors (see below), whose sum is σ = 826176741984. Its totient is φ = 489116098560.

The previous prime is 649919506651. The next prime is 649919506697. The reversal of 649919506655 is 556605919946.

It is not a de Polignac number, because 649919506655 - 2² = 649919506651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649919506591 and 649919506600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649919506651) 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, 1658306 + ... + 2012415.

It is an arithmetic number, because the mean of its divisors is an integer number (51636046374).

Almost surely, 2^649919506655 is an apocalyptic number.

649919506655 is a deficient number, since it is larger than the sum of its proper divisors (176257235329).

649919506655 is a wasteful number, since it uses less digits than its factorization.

649919506655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3672826.

The product of its (nonzero) digits is 78732000, while the sum is 65.

The spelling of 649919506655 in words is "six hundred forty-nine billion, nine hundred nineteen million, five hundred six thousand, six hundred fifty-five".