660780383 has 2 divisors, whose sum is σ = 660780384. Its totient is φ = 660780382.

The previous prime is 660780349. The next prime is 660780389. The reversal of 660780383 is 383087066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660780383 - 2²² = 656586079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660780383.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660780389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330390191 + 330390192.

It is an arithmetic number, because the mean of its divisors is an integer number (330390192).

Almost surely, 2^660780383 is an apocalyptic number.

660780383 is a deficient number, since it is larger than the sum of its proper divisors (1).

660780383 is an equidigital number, since it uses as much as digits as its factorization.

660780383 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 660780383 is about 25705.6488538998. The cubic root of 660780383 is about 871.0017891605.

The spelling of 660780383 in words is "six hundred sixty million, seven hundred eighty thousand, three hundred eighty-three".