66916523519 has 2 divisors, whose sum is σ = 66916523520. Its totient is φ = 66916523518.

The previous prime is 66916523473. The next prime is 66916523521. The reversal of 66916523519 is 91532561966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66916523519 - 2¹⁶ = 66916457983 is a prime.

It is a super-2 number, since 2×66916523519² (a number of 22 digits) contains 22 as substring.

Together with 66916523521, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66916523579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33458261759 + 33458261760.

It is an arithmetic number, because the mean of its divisors is an integer number (33458261760).

Almost surely, 2^66916523519 is an apocalyptic number.

66916523519 is a deficient number, since it is larger than the sum of its proper divisors (1).

66916523519 is an equidigital number, since it uses as much as digits as its factorization.

66916523519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2624400, while the sum is 53.

The spelling of 66916523519 in words is "sixty-six billion, nine hundred sixteen million, five hundred twenty-three thousand, five hundred nineteen".