665505151 has 2 divisors, whose sum is σ = 665505152. Its totient is φ = 665505150.

The previous prime is 665505143. The next prime is 665505221. The reversal of 665505151 is 151505566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665505151 - 2³ = 665505143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665505131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332752575 + 332752576.

It is an arithmetic number, because the mean of its divisors is an integer number (332752576).

Almost surely, 2^665505151 is an apocalyptic number.

665505151 is a deficient number, since it is larger than the sum of its proper divisors (1).

665505151 is an equidigital number, since it uses as much as digits as its factorization.

665505151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 665505151 is about 25797.3865149166. The cubic root of 665505151 is about 873.0728311119.

The spelling of 665505151 in words is "six hundred sixty-five million, five hundred five thousand, one hundred fifty-one".