66159139 has 2 divisors, whose sum is σ = 66159140. Its totient is φ = 66159138.

The previous prime is 66159133. The next prime is 66159143. The reversal of 66159139 is 93195166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66159139 - 2³ = 66159131 is a prime.

It is not a weakly prime, because it can be changed into another prime (66159131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33079569 + 33079570.

It is an arithmetic number, because the mean of its divisors is an integer number (33079570).

Almost surely, 2^66159139 is an apocalyptic number.

66159139 is a deficient number, since it is larger than the sum of its proper divisors (1).

66159139 is an equidigital number, since it uses as much as digits as its factorization.

66159139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 40.

The square root of 66159139 is about 8133.8268361209. The cubic root of 66159139 is about 404.4485488761.

The spelling of 66159139 in words is "sixty-six million, one hundred fifty-nine thousand, one hundred thirty-nine".