1666839629459 has 8 divisors (see below), whose sum is σ = 1705646107440. Its totient is φ = 1628035095456.

The previous prime is 1666839629407. The next prime is 1666839629461. The reversal of 1666839629459 is 9549269386661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666839629459 - 2¹⁶ = 1666839563923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666839623459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1326629 + ... + 2256905.

It is an arithmetic number, because the mean of its divisors is an integer number (213205763430).

Almost surely, 2^{1666839629459} is an apocalyptic number.

1666839629459 is a deficient number, since it is larger than the sum of its proper divisors (38806477981).

1666839629459 is an equidigital number, since it uses as much as digits as its factorization.

1666839629459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971989.

The product of its digits is 906992640, while the sum is 74.

The spelling of 1666839629459 in words is "one trillion, six hundred sixty-six billion, eight hundred thirty-nine million, six hundred twenty-nine thousand, four hundred fifty-nine".