6650649 has 6 divisors (see below), whose sum is σ = 9606506. Its totient is φ = 4433760.

The previous prime is 6650629. The next prime is 6650659. The reversal of 6650649 is 9460566.

It is a happy number.

6650649 is a `hidden beast` number, since 6 + 6 + 5 + 0 + 649 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6215049 + 435600 = 2493^2 + 660^2 .

It is not a de Polignac number, because 6650649 - 2⁷ = 6650521 is a prime.

It is a super-2 number, since 2×6650649² = 88462264242402, which contains 22 as substring.

It is a Duffinian number.

6650649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6650629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 369472 + ... + 369489.

Almost surely, 2^6650649 is an apocalyptic number.

It is an amenable number.

6650649 is a deficient number, since it is larger than the sum of its proper divisors (2955857).

6650649 is a wasteful number, since it uses less digits than its factorization.

6650649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738967 (or 738964 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 6650649 is about 2578.8852242781. The cubic root of 6650649 is about 188.0563528817.

The spelling of 6650649 in words is "six million, six hundred fifty thousand, six hundred forty-nine".