66680674747 has 2 divisors, whose sum is σ = 66680674748. Its totient is φ = 66680674746.

The previous prime is 66680674703. The next prime is 66680674751. The reversal of 66680674747 is 74747608666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66680674747 is a prime.

It is not a weakly prime, because it can be changed into another prime (66680674787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33340337373 + 33340337374.

It is an arithmetic number, because the mean of its divisors is an integer number (33340337374).

Almost surely, 2^66680674747 is an apocalyptic number.

66680674747 is a deficient number, since it is larger than the sum of its proper divisors (1).

66680674747 is an equidigital number, since it uses as much as digits as its factorization.

66680674747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56899584, while the sum is 61.

The spelling of 66680674747 in words is "sixty-six billion, six hundred eighty million, six hundred seventy-four thousand, seven hundred forty-seven".