660376553 has 2 divisors, whose sum is σ = 660376554. Its totient is φ = 660376552.

The previous prime is 660376547. The next prime is 660376573. The reversal of 660376553 is 355673066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 512705449 + 147671104 = 22643^2 + 12152^2 .

It is a cyclic number.

It is not a de Polignac number, because 660376553 - 2⁴ = 660376537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 660376553.

It is not a weakly prime, because it can be changed into another prime (660376523) 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, 330188276 + 330188277.

It is an arithmetic number, because the mean of its divisors is an integer number (330188277).

Almost surely, 2^660376553 is an apocalyptic number.

It is an amenable number.

660376553 is a deficient number, since it is larger than the sum of its proper divisors (1).

660376553 is an equidigital number, since it uses as much as digits as its factorization.

660376553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 340200, while the sum is 41.

The square root of 660376553 is about 25697.7927651384. The cubic root of 660376553 is about 870.8243180272.

The spelling of 660376553 in words is "six hundred sixty million, three hundred seventy-six thousand, five hundred fifty-three".