1666839629458 has 8 divisors (see below), whose sum is σ = 2586475287180. Its totient is φ = 804681200400.

The previous prime is 1666839629407. The next prime is 1666839629461. The reversal of 1666839629458 is 8549269386661.

It can be written as a sum of positive squares in 2 ways, for example, as 1534385122209 + 132454507249 = 1238703^2 + 363943^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14369307093 + ... + 14369307208.

Almost surely, 2^{1666839629458} is an apocalyptic number.

1666839629458 is a deficient number, since it is larger than the sum of its proper divisors (919635657722).

1666839629458 is a wasteful number, since it uses less digits than its factorization.

1666839629458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28738614332.

The product of its digits is 806215680, while the sum is 73.

The spelling of 1666839629458 in words is "one trillion, six hundred sixty-six billion, eight hundred thirty-nine million, six hundred twenty-nine thousand, four hundred fifty-eight".