660764443 has 2 divisors, whose sum is σ = 660764444. Its totient is φ = 660764442.

The previous prime is 660764437. The next prime is 660764477. The reversal of 660764443 is 344467066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660764443 - 2¹⁷ = 660633371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 660764396 and 660764405.

It is not a weakly prime, because it can be changed into another prime (660764543) 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, 330382221 + 330382222.

It is an arithmetic number, because the mean of its divisors is an integer number (330382222).

Almost surely, 2^660764443 is an apocalyptic number.

660764443 is a deficient number, since it is larger than the sum of its proper divisors (1).

660764443 is an equidigital number, since it uses as much as digits as its factorization.

660764443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 40.

The square root of 660764443 is about 25705.3388034470. The cubic root of 660764443 is about 870.9947853811.

The spelling of 660764443 in words is "six hundred sixty million, seven hundred sixty-four thousand, four hundred forty-three".