66550123547 has 2 divisors, whose sum is σ = 66550123548. Its totient is φ = 66550123546.

The previous prime is 66550123537. The next prime is 66550123553. The reversal of 66550123547 is 74532105566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66550123547 - 2⁴ = 66550123531 is a prime.

It is a super-3 number, since 3×66550123547³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 66550123498 and 66550123507.

It is not a weakly prime, because it can be changed into another prime (66550123537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33275061773 + 33275061774.

It is an arithmetic number, because the mean of its divisors is an integer number (33275061774).

Almost surely, 2^66550123547 is an apocalyptic number.

66550123547 is a deficient number, since it is larger than the sum of its proper divisors (1).

66550123547 is an equidigital number, since it uses as much as digits as its factorization.

66550123547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756000, while the sum is 44.

The spelling of 66550123547 in words is "sixty-six billion, five hundred fifty million, one hundred twenty-three thousand, five hundred forty-seven".