66158377 has 2 divisors, whose sum is σ = 66158378. Its totient is φ = 66158376.

The previous prime is 66158369. The next prime is 66158383. The reversal of 66158377 is 77385166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54523456 + 11634921 = 7384^2 + 3411^2 .

It is a cyclic number.

It is not a de Polignac number, because 66158377 - 2³ = 66158369 is a prime.

It is not a weakly prime, because it can be changed into another prime (66158317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33079188 + 33079189.

It is an arithmetic number, because the mean of its divisors is an integer number (33079189).

Almost surely, 2^66158377 is an apocalyptic number.

It is an amenable number.

66158377 is a deficient number, since it is larger than the sum of its proper divisors (1).

66158377 is an equidigital number, since it uses as much as digits as its factorization.

66158377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The square root of 66158377 is about 8133.7799945659. The cubic root of 66158377 is about 404.4469961001.

The spelling of 66158377 in words is "sixty-six million, one hundred fifty-eight thousand, three hundred seventy-seven".