1666839629407 has 2 divisors, whose sum is σ = 1666839629408. Its totient is φ = 1666839629406.

The previous prime is 1666839629353. The next prime is 1666839629461. The reversal of 1666839629407 is 7049269386661.

It is a balanced prime because it is at equal distance from previous prime (1666839629353) and next prime (1666839629461).

It is a cyclic number.

It is not a de Polignac number, because 1666839629407 - 2³¹ = 1664692145759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666839629107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833419814703 + 833419814704.

It is an arithmetic number, because the mean of its divisors is an integer number (833419814704).

Almost surely, 2^{1666839629407} is an apocalyptic number.

1666839629407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666839629407 is an equidigital number, since it uses as much as digits as its factorization.

1666839629407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141087744, while the sum is 67.

The spelling of 1666839629407 in words is "one trillion, six hundred sixty-six billion, eight hundred thirty-nine million, six hundred twenty-nine thousand, four hundred seven".