66741075647 has 2 divisors, whose sum is σ = 66741075648. Its totient is φ = 66741075646.

The previous prime is 66741075617. The next prime is 66741075733. The reversal of 66741075647 is 74657014766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66741075647 - 2⁸ = 66741075391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66741075607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33370537823 + 33370537824.

It is an arithmetic number, because the mean of its divisors is an integer number (33370537824).

Almost surely, 2^66741075647 is an apocalyptic number.

66741075647 is a deficient number, since it is larger than the sum of its proper divisors (1).

66741075647 is an equidigital number, since it uses as much as digits as its factorization.

66741075647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5927040, while the sum is 53.

The spelling of 66741075647 in words is "sixty-six billion, seven hundred forty-one million, seventy-five thousand, six hundred forty-seven".