660553519 has 2 divisors, whose sum is σ = 660553520. Its totient is φ = 660553518.

The previous prime is 660553507. The next prime is 660553529. The reversal of 660553519 is 915355066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660553519 - 2¹¹ = 660551471 is a prime.

It is a super-2 number, since 2×660553519² = 872661902926566722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660553529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330276759 + 330276760.

It is an arithmetic number, because the mean of its divisors is an integer number (330276760).

Almost surely, 2^660553519 is an apocalyptic number.

660553519 is a deficient number, since it is larger than the sum of its proper divisors (1).

660553519 is an equidigital number, since it uses as much as digits as its factorization.

660553519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 121500, while the sum is 40.

The square root of 660553519 is about 25701.2357485005. The cubic root of 660553519 is about 870.9020981623.

The spelling of 660553519 in words is "six hundred sixty million, five hundred fifty-three thousand, five hundred nineteen".