66100556611 has 2 divisors, whose sum is σ = 66100556612. Its totient is φ = 66100556610.

The previous prime is 66100556609. The next prime is 66100556699. The reversal of 66100556611 is 11665500166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66100556611 - 2¹ = 66100556609 is a prime.

Together with 66100556609, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66100506611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33050278305 + 33050278306.

It is an arithmetic number, because the mean of its divisors is an integer number (33050278306).

Almost surely, 2^66100556611 is an apocalyptic number.

66100556611 is a deficient number, since it is larger than the sum of its proper divisors (1).

66100556611 is an equidigital number, since it uses as much as digits as its factorization.

66100556611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 66100556611 in words is "sixty-six billion, one hundred million, five hundred fifty-six thousand, six hundred eleven".