666630051 has 4 divisors (see below), whose sum is σ = 888840072. Its totient is φ = 444420032.

The previous prime is 666630031. The next prime is 666630077. The reversal of 666630051 is 150036666.

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

It is a cyclic number.

It is not a de Polignac number, because 666630051 - 2⁷ = 666629923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666629994 and 666630021.

It is not an unprimeable number, because it can be changed into a prime (666630011) 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, 111105006 + ... + 111105011.

It is an arithmetic number, because the mean of its divisors is an integer number (222210018).

Almost surely, 2^666630051 is an apocalyptic number.

666630051 is a deficient number, since it is larger than the sum of its proper divisors (222210021).

666630051 is a wasteful number, since it uses less digits than its factorization.

666630051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222210020.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 666630051 is about 25819.1799056438. The cubic root of 666630051 is about 873.5644710779.

The spelling of 666630051 in words is "six hundred sixty-six million, six hundred thirty thousand, fifty-one".