666228151 has 2 divisors, whose sum is σ = 666228152. Its totient is φ = 666228150.

The previous prime is 666228139. The next prime is 666228169. The reversal of 666228151 is 151822666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666228151 - 2⁵ = 666228119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666228151.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666228191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333114075 + 333114076.

It is an arithmetic number, because the mean of its divisors is an integer number (333114076).

Almost surely, 2^666228151 is an apocalyptic number.

666228151 is a deficient number, since it is larger than the sum of its proper divisors (1).

666228151 is an equidigital number, since it uses as much as digits as its factorization.

666228151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 666228151 is about 25811.3957584630. The cubic root of 666228151 is about 873.3888833645.

The spelling of 666228151 in words is "six hundred sixty-six million, two hundred twenty-eight thousand, one hundred fifty-one".