66000157 has 2 divisors, whose sum is σ = 66000158. Its totient is φ = 66000156.

The previous prime is 66000149. The next prime is 66000169. The reversal of 66000157 is 75100066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64947481 + 1052676 = 8059^2 + 1026^2 .

It is a cyclic number.

It is not a de Polignac number, because 66000157 - 2³ = 66000149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66000257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000078 + 33000079.

It is an arithmetic number, because the mean of its divisors is an integer number (33000079).

Almost surely, 2^66000157 is an apocalyptic number.

It is an amenable number.

66000157 is a deficient number, since it is larger than the sum of its proper divisors (1).

66000157 is an equidigital number, since it uses as much as digits as its factorization.

66000157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 66000157 is about 8124.0480673123. The cubic root of 66000157 is about 404.1243225037.

Subtracting 66000157 from its reverse (75100066), we obtain a palindrome (9099909).

The spelling of 66000157 in words is "sixty-six million, one hundred fifty-seven", and thus it is an aban number.