651561650 has 12 divisors (see below), whose sum is σ = 1211904762. Its totient is φ = 260624640.

The previous prime is 651561637. The next prime is 651561761. The reversal of 651561650 is 56165156.

It can be written as a sum of positive squares in 3 ways, for example, as 391287961 + 260273689 = 19781^2 + 16133^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 651561650.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6515567 + ... + 6515666.

Almost surely, 2^651561650 is an apocalyptic number.

651561650 is a deficient number, since it is larger than the sum of its proper divisors (560343112).

651561650 is a wasteful number, since it uses less digits than its factorization.

651561650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13031245 (or 13031240 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 651561650 is about 25525.7056709506. The cubic root of 651561650 is about 866.9322747707.

The spelling of 651561650 in words is "six hundred fifty-one million, five hundred sixty-one thousand, six hundred fifty".