660787139 has 2 divisors, whose sum is σ = 660787140. Its totient is φ = 660787138.

The previous prime is 660787123. The next prime is 660787207. The reversal of 660787139 is 931787066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660787139 - 2⁴ = 660787123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 660787093 and 660787102.

It is not a weakly prime, because it can be changed into another prime (660787109) 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, 330393569 + 330393570.

It is an arithmetic number, because the mean of its divisors is an integer number (330393570).

Almost surely, 2^660787139 is an apocalyptic number.

660787139 is a deficient number, since it is larger than the sum of its proper divisors (1).

660787139 is an equidigital number, since it uses as much as digits as its factorization.

660787139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 660787139 is about 25705.7802643686. The cubic root of 660787139 is about 871.0047576042.

The spelling of 660787139 in words is "six hundred sixty million, seven hundred eighty-seven thousand, one hundred thirty-nine".