666334157 has 2 divisors, whose sum is σ = 666334158. Its totient is φ = 666334156.

The previous prime is 666334153. The next prime is 666334213. The reversal of 666334157 is 751433666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 576672196 + 89661961 = 24014^2 + 9469^2 .

It is a cyclic number.

It is not a de Polignac number, because 666334157 - 2² = 666334153 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666334153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333167078 + 333167079.

It is an arithmetic number, because the mean of its divisors is an integer number (333167079).

Almost surely, 2^666334157 is an apocalyptic number.

It is an amenable number.

666334157 is a deficient number, since it is larger than the sum of its proper divisors (1).

666334157 is an equidigital number, since it uses as much as digits as its factorization.

666334157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 41.

The square root of 666334157 is about 25813.4491496197. The cubic root of 666334157 is about 873.4352036087.

The spelling of 666334157 in words is "six hundred sixty-six million, three hundred thirty-four thousand, one hundred fifty-seven".