650721616 has 10 divisors (see below), whose sum is σ = 1260773162. Its totient is φ = 325360800.

The previous prime is 650721613. The next prime is 650721637. The reversal of 650721616 is 616127056.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 436977216 + 213744400 = 20904^2 + 14620^2 .

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650721613) 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 as a sum of consecutive naturals, namely, 20335035 + ... + 20335066.

Almost surely, 2^650721616 is an apocalyptic number.

It is an amenable number.

650721616 is a deficient number, since it is larger than the sum of its proper divisors (610051546).

650721616 is a wasteful number, since it uses less digits than its factorization.

650721616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40670109 (or 40670103 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 650721616 is about 25509.2456964137. The cubic root of 650721616 is about 866.5595467868.

The spelling of 650721616 in words is "six hundred fifty million, seven hundred twenty-one thousand, six hundred sixteen".