665000051 has 2 divisors, whose sum is σ = 665000052. Its totient is φ = 665000050.

The previous prime is 665000029. The next prime is 665000071. The reversal of 665000051 is 150000566.

665000051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665000051 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 664999990 and 665000026.

It is not a weakly prime, because it can be changed into another prime (665000071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332500025 + 332500026.

It is an arithmetic number, because the mean of its divisors is an integer number (332500026).

Almost surely, 2^665000051 is an apocalyptic number.

665000051 is a deficient number, since it is larger than the sum of its proper divisors (1).

665000051 is an equidigital number, since it uses as much as digits as its factorization.

665000051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 665000051 is about 25787.5949053028. The cubic root of 665000051 is about 872.8518958321.

The spelling of 665000051 in words is "six hundred sixty-five million, fifty-one", and thus it is an aban number.