6651000161 has 4 divisors (see below), whose sum is σ = 7162615572. Its totient is φ = 6139384752.

The previous prime is 6651000133. The next prime is 6651000163. The reversal of 6651000161 is 1610001566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1610001566 = 2 ⋅805000783.

It can be written as a sum of positive squares in 2 ways, for example, as 3900627025 + 2750373136 = 62455^2 + 52444^2 .

It is a cyclic number.

It is not a de Polignac number, because 6651000161 - 2¹⁰ = 6650999137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6651000161.

It is not an unprimeable number, because it can be changed into a prime (6651000163) 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, 255807686 + ... + 255807711.

It is an arithmetic number, because the mean of its divisors is an integer number (1790653893).

Almost surely, 2^6651000161 is an apocalyptic number.

It is an amenable number.

6651000161 is a deficient number, since it is larger than the sum of its proper divisors (511615411).

6651000161 is a wasteful number, since it uses less digits than its factorization.

6651000161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511615410.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 6651000161 is about 81553.6643014892. The cubic root of 6651000161 is about 1880.5966267875.

The spelling of 6651000161 in words is "six billion, six hundred fifty-one million, one hundred sixty-one", and thus it is an aban number.