66506010551 has 2 divisors, whose sum is σ = 66506010552. Its totient is φ = 66506010550.

The previous prime is 66506010533. The next prime is 66506010553. The reversal of 66506010551 is 15501060566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66506010551 - 2¹⁰ = 66506009527 is a prime.

Together with 66506010553, 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 (66506010553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33253005275 + 33253005276.

It is an arithmetic number, because the mean of its divisors is an integer number (33253005276).

Almost surely, 2^66506010551 is an apocalyptic number.

66506010551 is a deficient number, since it is larger than the sum of its proper divisors (1).

66506010551 is an equidigital number, since it uses as much as digits as its factorization.

66506010551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 66506010551 in words is "sixty-six billion, five hundred six million, ten thousand, five hundred fifty-one".