66515500607 has 2 divisors, whose sum is σ = 66515500608. Its totient is φ = 66515500606.

The previous prime is 66515500553. The next prime is 66515500609. The reversal of 66515500607 is 70600551566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66515500607 - 2²⁸ = 66247065151 is a prime.

Together with 66515500609, 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 (66515500609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33257750303 + 33257750304.

It is an arithmetic number, because the mean of its divisors is an integer number (33257750304).

Almost surely, 2^66515500607 is an apocalyptic number.

66515500607 is a deficient number, since it is larger than the sum of its proper divisors (1).

66515500607 is an equidigital number, since it uses as much as digits as its factorization.

66515500607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189000, while the sum is 41.

The spelling of 66515500607 in words is "sixty-six billion, five hundred fifteen million, five hundred thousand, six hundred seven".