660226139 has 2 divisors, whose sum is σ = 660226140. Its totient is φ = 660226138.

The previous prime is 660226123. The next prime is 660226163. The reversal of 660226139 is 931622066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660226139 - 2⁴ = 660226123 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 660226099 and 660226108.

It is not a weakly prime, because it can be changed into another prime (660226169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330113069 + 330113070.

It is an arithmetic number, because the mean of its divisors is an integer number (330113070).

Almost surely, 2^660226139 is an apocalyptic number.

660226139 is a deficient number, since it is larger than the sum of its proper divisors (1).

660226139 is an equidigital number, since it uses as much as digits as its factorization.

660226139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 660226139 is about 25694.8660047100. The cubic root of 660226139 is about 870.7581971075.

The spelling of 660226139 in words is "six hundred sixty million, two hundred twenty-six thousand, one hundred thirty-nine".