66354139 has 2 divisors, whose sum is σ = 66354140. Its totient is φ = 66354138.

The previous prime is 66354107. The next prime is 66354157. The reversal of 66354139 is 93145366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66354139 - 2⁵ = 66354107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66354098 and 66354107.

It is not a weakly prime, because it can be changed into another prime (66354199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33177069 + 33177070.

It is an arithmetic number, because the mean of its divisors is an integer number (33177070).

Almost surely, 2^66354139 is an apocalyptic number.

66354139 is a deficient number, since it is larger than the sum of its proper divisors (1).

66354139 is an equidigital number, since it uses as much as digits as its factorization.

66354139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 37.

The square root of 66354139 is about 8145.8049939831. The cubic root of 66354139 is about 404.8455215352.

The spelling of 66354139 in words is "sixty-six million, three hundred fifty-four thousand, one hundred thirty-nine".