66670646741 has 2 divisors, whose sum is σ = 66670646742. Its totient is φ = 66670646740.

The previous prime is 66670646729. The next prime is 66670646761. The reversal of 66670646741 is 14764607666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58435810225 + 8234836516 = 241735^2 + 90746^2 .

It is a cyclic number.

It is not a de Polignac number, because 66670646741 - 2⁶ = 66670646677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66670646711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335323370 + 33335323371.

It is an arithmetic number, because the mean of its divisors is an integer number (33335323371).

Almost surely, 2^66670646741 is an apocalyptic number.

It is an amenable number.

66670646741 is a deficient number, since it is larger than the sum of its proper divisors (1).

66670646741 is an equidigital number, since it uses as much as digits as its factorization.

66670646741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 53.

The spelling of 66670646741 in words is "sixty-six billion, six hundred seventy million, six hundred forty-six thousand, seven hundred forty-one".