649916653 has 2 divisors, whose sum is σ = 649916654. Its totient is φ = 649916652.

The previous prime is 649916639. The next prime is 649916671. The reversal of 649916653 is 356619946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 458730724 + 191185929 = 21418^2 + 13827^2 .

It is a cyclic number.

It is not a de Polignac number, because 649916653 - 2⁵ = 649916621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 649916597 and 649916606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649916633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324958326 + 324958327.

It is an arithmetic number, because the mean of its divisors is an integer number (324958327).

Almost surely, 2^649916653 is an apocalyptic number.

It is an amenable number.

649916653 is a deficient number, since it is larger than the sum of its proper divisors (1).

649916653 is an equidigital number, since it uses as much as digits as its factorization.

649916653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 49.

The square root of 649916653 is about 25493.4629464104. The cubic root of 649916653 is about 866.2020789220.

The spelling of 649916653 in words is "six hundred forty-nine million, nine hundred sixteen thousand, six hundred fifty-three".