66888377 has 2 divisors, whose sum is σ = 66888378. Its totient is φ = 66888376.

The previous prime is 66888337. The next prime is 66888407. The reversal of 66888377 is 77388866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63186601 + 3701776 = 7949^2 + 1924^2 .

It is a cyclic number.

It is not a de Polignac number, because 66888377 - 2⁸ = 66888121 is a prime.

It is not a weakly prime, because it can be changed into another prime (66888317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33444188 + 33444189.

It is an arithmetic number, because the mean of its divisors is an integer number (33444189).

Almost surely, 2^66888377 is an apocalyptic number.

It is an amenable number.

66888377 is a deficient number, since it is larger than the sum of its proper divisors (1).

66888377 is an equidigital number, since it uses as much as digits as its factorization.

66888377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 53.

The square root of 66888377 is about 8178.5314696466. The cubic root of 66888377 is about 405.9291313449.

The spelling of 66888377 in words is "sixty-six million, eight hundred eighty-eight thousand, three hundred seventy-seven".