1066658336639 has 8 divisors (see below), whose sum is σ = 1219069145088. Its totient is φ = 914255289720.

The previous prime is 1066658336587. The next prime is 1066658336677. The reversal of 1066658336639 is 9366338566601.

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 1066658336639 - 2¹⁶ = 1066658271103 is a prime.

It is a super-2 number, since 2×1066658336639² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066658336699) 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, 1642847 + ... + 2198240.

It is an arithmetic number, because the mean of its divisors is an integer number (152383643136).

Almost surely, 2^{1066658336639} is an apocalyptic number.

1066658336639 is a deficient number, since it is larger than the sum of its proper divisors (152410808449).

1066658336639 is an equidigital number, since it uses as much as digits as its factorization.

1066658336639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3880765.

The product of its (nonzero) digits is 75582720, while the sum is 62.

The spelling of 1066658336639 in words is "one trillion, sixty-six billion, six hundred fifty-eight million, three hundred thirty-six thousand, six hundred thirty-nine".