66000051 has 12 divisors (see below), whose sum is σ = 102666928. Its totient is φ = 40615344.

The previous prime is 66000049. The next prime is 66000071. The reversal of 66000051 is 15000066.

66000051 is a `hidden beast` number, since 660 + 0 + 0 + 0 + 5 + 1 = 666.

It is not a de Polignac number, because 66000051 - 2¹ = 66000049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65999988 and 66000033.

It is not an unprimeable number, because it can be changed into a prime (66000071) 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, 281935 + ... + 282168.

Almost surely, 2^66000051 is an apocalyptic number.

66000051 is a deficient number, since it is larger than the sum of its proper divisors (36666877).

66000051 is a wasteful number, since it uses less digits than its factorization.

66000051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564122 (or 564119 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 66000051 is about 8124.0415434684. The cubic root of 66000051 is about 404.1241061547.

The spelling of 66000051 in words is "sixty-six million, fifty-one", and thus it is an aban number and an uban number.