1666700407 has 2 divisors, whose sum is σ = 1666700408. Its totient is φ = 1666700406.

The previous prime is 1666700353. The next prime is 1666700411. The reversal of 1666700407 is 7040076661.

It is a strong prime.

It is an emirp because it is prime and its reverse (7040076661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666700407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666700437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833350203 + 833350204.

It is an arithmetic number, because the mean of its divisors is an integer number (833350204).

Almost surely, 2^1666700407 is an apocalyptic number.

1666700407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666700407 is an equidigital number, since it uses as much as digits as its factorization.

1666700407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 1666700407 is about 40825.2422772970. The cubic root of 1666700407 is about 1185.6391021604.

The spelling of 1666700407 in words is "one billion, six hundred sixty-six million, seven hundred thousand, four hundred seven".