1666335947707 has 2 divisors, whose sum is σ = 1666335947708. Its totient is φ = 1666335947706.

The previous prime is 1666335947671. The next prime is 1666335947737. The reversal of 1666335947707 is 7077495336661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666335947707 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666335947737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833167973853 + 833167973854.

It is an arithmetic number, because the mean of its divisors is an integer number (833167973854).

Almost surely, 2^{1666335947707} is an apocalyptic number.

1666335947707 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666335947707 is an equidigital number, since it uses as much as digits as its factorization.

1666335947707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120022560, while the sum is 64.

The spelling of 1666335947707 in words is "one trillion, six hundred sixty-six billion, three hundred thirty-five million, nine hundred forty-seven thousand, seven hundred seven".