649631868136946 has 16 divisors (see below), whose sum is σ = 1008051147330840. Its totient is φ = 313614856732800.

The previous prime is 649631868136931. The next prime is 649631868136981.

649631868136946 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 647659795603921 + 1972072533025 = 25449161^2 + 1404305^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26498390 + ... + 44737326.

Almost surely, 2^{649631868136946} is an apocalyptic number.

649631868136946 is a deficient number, since it is larger than the sum of its proper divisors (358419279193894).

649631868136946 is a wasteful number, since it uses less digits than its factorization.

649631868136946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18853069.

The product of its digits is 5804752896, while the sum is 80.

The spelling of 649631868136946 in words is "six hundred forty-nine trillion, six hundred thirty-one billion, eight hundred sixty-eight million, one hundred thirty-six thousand, nine hundred forty-six".