651601165 has 4 divisors (see below), whose sum is σ = 781921404. Its totient is φ = 521280928.

The previous prime is 651601163. The next prime is 651601187. The reversal of 651601165 is 561106156.

651601165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 199996164 + 451605001 = 14142^2 + 21251^2 .

It is a cyclic number.

It is not a de Polignac number, because 651601165 - 2¹ = 651601163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651601163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65160112 + ... + 65160121.

It is an arithmetic number, because the mean of its divisors is an integer number (195480351).

Almost surely, 2^651601165 is an apocalyptic number.

It is an amenable number.

651601165 is a deficient number, since it is larger than the sum of its proper divisors (130320239).

651601165 is a wasteful number, since it uses less digits than its factorization.

651601165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130320238.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 651601165 is about 25526.4796828705. The cubic root of 651601165 is about 866.9497999152.

The spelling of 651601165 in words is "six hundred fifty-one million, six hundred one thousand, one hundred sixty-five".