650721617 has 12 divisors (see below), whose sum is σ = 815190516. Its totient is φ = 514856160.

The previous prime is 650721613. The next prime is 650721637. The reversal of 650721617 is 716127056.

It can be written as a sum of positive squares in 2 ways, for example, as 143616256 + 507105361 = 11984^2 + 22519^2 .

It is not a de Polignac number, because 650721617 - 2² = 650721613 is a prime.

It is not an unprimeable number, because it can be changed into a prime (650721613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 510134 + ... + 511407.

It is an arithmetic number, because the mean of its divisors is an integer number (67932543).

Almost surely, 2^650721617 is an apocalyptic number.

It is an amenable number.

650721617 is a deficient number, since it is larger than the sum of its proper divisors (164468899).

650721617 is a wasteful number, since it uses less digits than its factorization.

650721617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021568 (or 1021561 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 650721617 is about 25509.2457160144. The cubic root of 650721617 is about 866.5595472307.

The spelling of 650721617 in words is "six hundred fifty million, seven hundred twenty-one thousand, six hundred seventeen".